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Finding the Fourth Proportional to 63.12, 87.04 and 38.55

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Solution

The fourth proportional to 63.12, 87.04 and 38.55 is: 53.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.12 : 87.04 = 38.55 : x
  2. Step 2: Convert to fraction form
    63.12/87.04 = 38.55/x
  3. Step 3: Cross multiply
    63.12x = 87.04 × 38.55
  4. Step 4: Simplify right side
    63.12x = 3,355.39
  5. Step 5: Solve for x
    x = 3,355.39/63.12
  6. Step 6: Final answer
    x = 53.16

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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.