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Finding the Fourth Proportional to 640,021.40, 960,032.10 and 404,408.60

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Solution

The fourth proportional to 640,021.40, 960,032.10 and 404,408.60 is: 606,612.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,021.40 : 960,032.10 = 404,408.60 : x
  2. Step 2: Convert to fraction form
    640,021.40/960,032.10 = 404,408.60/x
  3. Step 3: Cross multiply
    640,021.40x = 960,032.10 × 404,408.60
  4. Step 4: Simplify right side
    640,021.40x = 388,245,237,516.06
  5. Step 5: Solve for x
    x = 388,245,237,516.06/640,021.40
  6. Step 6: Final answer
    x = 606,612.90

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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.