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Finding the Fourth Proportional to 63.47, 87.54 and 40.15

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Solution

The fourth proportional to 63.47, 87.54 and 40.15 is: 55.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.47 : 87.54 = 40.15 : x
  2. Step 2: Convert to fraction form
    63.47/87.54 = 40.15/x
  3. Step 3: Cross multiply
    63.47x = 87.54 × 40.15
  4. Step 4: Simplify right side
    63.47x = 3,514.78
  5. Step 5: Solve for x
    x = 3,514.78/63.47
  6. Step 6: Final answer
    x = 55.37

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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.