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Finding the Fourth Proportional to 75.52, 104.38 and 66.71

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Solution

The fourth proportional to 75.52, 104.38 and 66.71 is: 92.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.52 : 104.38 = 66.71 : x
  2. Step 2: Convert to fraction form
    75.52/104.38 = 66.71/x
  3. Step 3: Cross multiply
    75.52x = 104.38 × 66.71
  4. Step 4: Simplify right side
    75.52x = 6,963.28
  5. Step 5: Solve for x
    x = 6,963.28/75.52
  6. Step 6: Final answer
    x = 92.21

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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.