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Finding the Fourth Proportional to 521.73, 781.38 and 316.13

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Solution

The fourth proportional to 521.73, 781.38 and 316.13 is: 473.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.73 : 781.38 = 316.13 : x
  2. Step 2: Convert to fraction form
    521.73/781.38 = 316.13/x
  3. Step 3: Cross multiply
    521.73x = 781.38 × 316.13
  4. Step 4: Simplify right side
    521.73x = 247,013.75
  5. Step 5: Solve for x
    x = 247,013.75/521.73
  6. Step 6: Final answer
    x = 473.45

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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.