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Finding the Fourth Proportional to 63.10, 87.10 and 38.56

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Solution

The fourth proportional to 63.10, 87.10 and 38.56 is: 53.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.10 : 87.10 = 38.56 : x
  2. Step 2: Convert to fraction form
    63.10/87.10 = 38.56/x
  3. Step 3: Cross multiply
    63.10x = 87.10 × 38.56
  4. Step 4: Simplify right side
    63.10x = 3,358.58
  5. Step 5: Solve for x
    x = 3,358.58/63.10
  6. Step 6: Final answer
    x = 53.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.