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Finding the Fourth Proportional to 63.17, 86.89 and 55.65

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Solution

The fourth proportional to 63.17, 86.89 and 55.65 is: 76.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.17 : 86.89 = 55.65 : x
  2. Step 2: Convert to fraction form
    63.17/86.89 = 55.65/x
  3. Step 3: Cross multiply
    63.17x = 86.89 × 55.65
  4. Step 4: Simplify right side
    63.17x = 4,835.15
  5. Step 5: Solve for x
    x = 4,835.15/63.17
  6. Step 6: Final answer
    x = 76.55

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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.