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Finding the Fourth Proportional to 63.89, 87.60 and 63.73

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Solution

The fourth proportional to 63.89, 87.60 and 63.73 is: 87.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.89 : 87.60 = 63.73 : x
  2. Step 2: Convert to fraction form
    63.89/87.60 = 63.73/x
  3. Step 3: Cross multiply
    63.89x = 87.60 × 63.73
  4. Step 4: Simplify right side
    63.89x = 5,582.75
  5. Step 5: Solve for x
    x = 5,582.75/63.89
  6. Step 6: Final answer
    x = 87.38

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.