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Finding the Fourth Proportional to 521.22, 781.48 and 356.72

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Solution

The fourth proportional to 521.22, 781.48 and 356.72 is: 534.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.22 : 781.48 = 356.72 : x
  2. Step 2: Convert to fraction form
    521.22/781.48 = 356.72/x
  3. Step 3: Cross multiply
    521.22x = 781.48 × 356.72
  4. Step 4: Simplify right side
    521.22x = 278,769.55
  5. Step 5: Solve for x
    x = 278,769.55/521.22
  6. Step 6: Final answer
    x = 534.84

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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.