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Finding the Fourth Proportional to 63.47, 87.15 and 55.64

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Solution

The fourth proportional to 63.47, 87.15 and 55.64 is: 76.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.47 : 87.15 = 55.64 : x
  2. Step 2: Convert to fraction form
    63.47/87.15 = 55.64/x
  3. Step 3: Cross multiply
    63.47x = 87.15 × 55.64
  4. Step 4: Simplify right side
    63.47x = 4,848.59
  5. Step 5: Solve for x
    x = 4,848.59/63.47
  6. Step 6: Final answer
    x = 76.40

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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.