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Finding the Fourth Proportional to 71.71, 99.02 and 55.31

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Solution

The fourth proportional to 71.71, 99.02 and 55.31 is: 76.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.71 : 99.02 = 55.31 : x
  2. Step 2: Convert to fraction form
    71.71/99.02 = 55.31/x
  3. Step 3: Cross multiply
    71.71x = 99.02 × 55.31
  4. Step 4: Simplify right side
    71.71x = 5,476.44
  5. Step 5: Solve for x
    x = 5,476.44/71.71
  6. Step 6: Final answer
    x = 76.37

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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.