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Finding the Fourth Proportional to 521.43, 781.98 and 156.12

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Solution

The fourth proportional to 521.43, 781.98 and 156.12 is: 234.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.43 : 781.98 = 156.12 : x
  2. Step 2: Convert to fraction form
    521.43/781.98 = 156.12/x
  3. Step 3: Cross multiply
    521.43x = 781.98 × 156.12
  4. Step 4: Simplify right side
    521.43x = 122,082.72
  5. Step 5: Solve for x
    x = 122,082.72/521.43
  6. Step 6: Final answer
    x = 234.13

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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.