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Finding the Fourth Proportional to 520,082.30, 780,123.45 and 425,603.90

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Solution

The fourth proportional to 520,082.30, 780,123.45 and 425,603.90 is: 638,405.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,082.30 : 780,123.45 = 425,603.90 : x
  2. Step 2: Convert to fraction form
    520,082.30/780,123.45 = 425,603.90/x
  3. Step 3: Cross multiply
    520,082.30x = 780,123.45 × 425,603.90
  4. Step 4: Simplify right side
    520,082.30x = 332,023,582,801.46
  5. Step 5: Solve for x
    x = 332,023,582,801.46/520,082.30
  6. Step 6: Final answer
    x = 638,405.85

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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.