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Finding the Fourth Proportional to 63.48, 87.66 and 62.85

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Solution

The fourth proportional to 63.48, 87.66 and 62.85 is: 86.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.48 : 87.66 = 62.85 : x
  2. Step 2: Convert to fraction form
    63.48/87.66 = 62.85/x
  3. Step 3: Cross multiply
    63.48x = 87.66 × 62.85
  4. Step 4: Simplify right side
    63.48x = 5,509.43
  5. Step 5: Solve for x
    x = 5,509.43/63.48
  6. Step 6: Final answer
    x = 86.79

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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.