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Finding the Fourth Proportional to 640,013.60, 960,020.40 and 515,597.60

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Solution

The fourth proportional to 640,013.60, 960,020.40 and 515,597.60 is: 773,396.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,013.60 : 960,020.40 = 515,597.60 : x
  2. Step 2: Convert to fraction form
    640,013.60/960,020.40 = 515,597.60/x
  3. Step 3: Cross multiply
    640,013.60x = 960,020.40 × 515,597.60
  4. Step 4: Simplify right side
    640,013.60x = 494,984,214,191.04
  5. Step 5: Solve for x
    x = 494,984,214,191.04/640,013.60
  6. Step 6: Final answer
    x = 773,396.40

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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.