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Finding the Fourth Proportional to 520,082.15, 780,123.23 and 485,090.15

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Solution

The fourth proportional to 520,082.15, 780,123.23 and 485,090.15 is: 727,635.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,082.15 : 780,123.23 = 485,090.15 : x
  2. Step 2: Convert to fraction form
    520,082.15/780,123.23 = 485,090.15/x
  3. Step 3: Cross multiply
    520,082.15x = 780,123.23 × 485,090.15
  4. Step 4: Simplify right side
    520,082.15x = 378,430,092,233.73
  5. Step 5: Solve for x
    x = 378,430,092,233.73/520,082.15
  6. Step 6: Final answer
    x = 727,635.23

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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.