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Finding the Fourth Proportional to 640,612,074.40, 960,918,111.60 and 640,612,074.40

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Solution

The fourth proportional to 640,612,074.40, 960,918,111.60 and 640,612,074.40 is: 960,918,111.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,612,074.40 : 960,918,111.60 = 640,612,074.40 : x
  2. Step 2: Convert to fraction form
    640,612,074.40/960,918,111.60 = 640,612,074.40/x
  3. Step 3: Cross multiply
    640,612,074.40x = 960,918,111.60 × 640,612,074.40
  4. Step 4: Simplify right side
    640,612,074.40x = 615,575,744,800,606,720
  5. Step 5: Solve for x
    x = 615,575,744,800,606,720/640,612,074.40
  6. Step 6: Final answer
    x = 960,918,111.60

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.