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Finding the Fourth Proportional to 63.51, 87.66 and 55.17

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Solution

The fourth proportional to 63.51, 87.66 and 55.17 is: 76.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.51 : 87.66 = 55.17 : x
  2. Step 2: Convert to fraction form
    63.51/87.66 = 55.17/x
  3. Step 3: Cross multiply
    63.51x = 87.66 × 55.17
  4. Step 4: Simplify right side
    63.51x = 4,836.20
  5. Step 5: Solve for x
    x = 4,836.20/63.51
  6. Step 6: Final answer
    x = 76.15

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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.