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Finding the Fourth Proportional to 520,082.10, 780,123.15 and 165,123.90

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Solution

The fourth proportional to 520,082.10, 780,123.15 and 165,123.90 is: 247,685.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,082.10 : 780,123.15 = 165,123.90 : x
  2. Step 2: Convert to fraction form
    520,082.10/780,123.15 = 165,123.90/x
  3. Step 3: Cross multiply
    520,082.10x = 780,123.15 × 165,123.90
  4. Step 4: Simplify right side
    520,082.10x = 128,816,977,008.29
  5. Step 5: Solve for x
    x = 128,816,977,008.29/520,082.10
  6. Step 6: Final answer
    x = 247,685.85

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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.