Home / 521,131.40-781,697.10-486,139.40

Finding the Fourth Proportional to 521,131.40, 781,697.10 and 486,139.40

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Solution

The fourth proportional to 521,131.40, 781,697.10 and 486,139.40 is: 729,209.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,131.40 : 781,697.10 = 486,139.40 : x
  2. Step 2: Convert to fraction form
    521,131.40/781,697.10 = 486,139.40/x
  3. Step 3: Cross multiply
    521,131.40x = 781,697.10 × 486,139.40
  4. Step 4: Simplify right side
    521,131.40x = 380,013,759,175.74
  5. Step 5: Solve for x
    x = 380,013,759,175.74/521,131.40
  6. Step 6: Final answer
    x = 729,209.10

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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.