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Finding the Fourth Proportional to 521.26, 781.81 and 315.63

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Solution

The fourth proportional to 521.26, 781.81 and 315.63 is: 473.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.26 : 781.81 = 315.63 : x
  2. Step 2: Convert to fraction form
    521.26/781.81 = 315.63/x
  3. Step 3: Cross multiply
    521.26x = 781.81 × 315.63
  4. Step 4: Simplify right side
    521.26x = 246,761.90
  5. Step 5: Solve for x
    x = 246,761.90/521.26
  6. Step 6: Final answer
    x = 473.40

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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.