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Finding the Fourth Proportional to 661,645.40, 992,468.10 and 380,931.80

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Solution

The fourth proportional to 661,645.40, 992,468.10 and 380,931.80 is: 571,397.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,645.40 : 992,468.10 = 380,931.80 : x
  2. Step 2: Convert to fraction form
    661,645.40/992,468.10 = 380,931.80/x
  3. Step 3: Cross multiply
    661,645.40x = 992,468.10 × 380,931.80
  4. Step 4: Simplify right side
    661,645.40x = 378,062,659,775.58
  5. Step 5: Solve for x
    x = 378,062,659,775.58/661,645.40
  6. Step 6: Final answer
    x = 571,397.70

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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.