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Finding the Fourth Proportional to 63.29, 87.75 and 61.22

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Solution

The fourth proportional to 63.29, 87.75 and 61.22 is: 84.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.29 : 87.75 = 61.22 : x
  2. Step 2: Convert to fraction form
    63.29/87.75 = 61.22/x
  3. Step 3: Cross multiply
    63.29x = 87.75 × 61.22
  4. Step 4: Simplify right side
    63.29x = 5,371.62
  5. Step 5: Solve for x
    x = 5,371.62/63.29
  6. Step 6: Final answer
    x = 84.88

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.