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Finding the Fourth Proportional to 66.61, 100.41 and 60.97

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Solution

The fourth proportional to 66.61, 100.41 and 60.97 is: 91.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.61 : 100.41 = 60.97 : x
  2. Step 2: Convert to fraction form
    66.61/100.41 = 60.97/x
  3. Step 3: Cross multiply
    66.61x = 100.41 × 60.97
  4. Step 4: Simplify right side
    66.61x = 6,121.75
  5. Step 5: Solve for x
    x = 6,121.75/66.61
  6. Step 6: Final answer
    x = 91.91

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.