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Finding the Fourth Proportional to 71.87, 99.13 and 55.47

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Solution

The fourth proportional to 71.87, 99.13 and 55.47 is: 76.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.87 : 99.13 = 55.47 : x
  2. Step 2: Convert to fraction form
    71.87/99.13 = 55.47/x
  3. Step 3: Cross multiply
    71.87x = 99.13 × 55.47
  4. Step 4: Simplify right side
    71.87x = 5,498.74
  5. Step 5: Solve for x
    x = 5,498.74/71.87
  6. Step 6: Final answer
    x = 76.51

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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.