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Finding the Fourth Proportional to 486,123.20, 729,184.80 and 409,140.80

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Solution

The fourth proportional to 486,123.20, 729,184.80 and 409,140.80 is: 613,711.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,123.20 : 729,184.80 = 409,140.80 : x
  2. Step 2: Convert to fraction form
    486,123.20/729,184.80 = 409,140.80/x
  3. Step 3: Cross multiply
    486,123.20x = 729,184.80 × 409,140.80
  4. Step 4: Simplify right side
    486,123.20x = 298,339,252,419.84
  5. Step 5: Solve for x
    x = 298,339,252,419.84/486,123.20
  6. Step 6: Final answer
    x = 613,711.20

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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.