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Finding the Fourth Proportional to 63.17, 87.38 and 55.20

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Solution

The fourth proportional to 63.17, 87.38 and 55.20 is: 76.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.17 : 87.38 = 55.20 : x
  2. Step 2: Convert to fraction form
    63.17/87.38 = 55.20/x
  3. Step 3: Cross multiply
    63.17x = 87.38 × 55.20
  4. Step 4: Simplify right side
    63.17x = 4,823.10
  5. Step 5: Solve for x
    x = 4,823.10/63.17
  6. Step 6: Final answer
    x = 76.36

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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.