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Finding the Fourth Proportional to 63.72, 87.89 and 49.21

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Solution

The fourth proportional to 63.72, 87.89 and 49.21 is: 67.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.72 : 87.89 = 49.21 : x
  2. Step 2: Convert to fraction form
    63.72/87.89 = 49.21/x
  3. Step 3: Cross multiply
    63.72x = 87.89 × 49.21
  4. Step 4: Simplify right side
    63.72x = 4,324.60
  5. Step 5: Solve for x
    x = 4,324.60/63.72
  6. Step 6: Final answer
    x = 67.87

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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.