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Finding the Fourth Proportional to 63.25, 87.31 and 39.98

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Solution

The fourth proportional to 63.25, 87.31 and 39.98 is: 55.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.25 : 87.31 = 39.98 : x
  2. Step 2: Convert to fraction form
    63.25/87.31 = 39.98/x
  3. Step 3: Cross multiply
    63.25x = 87.31 × 39.98
  4. Step 4: Simplify right side
    63.25x = 3,490.28
  5. Step 5: Solve for x
    x = 3,490.28/63.25
  6. Step 6: Final answer
    x = 55.18

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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.