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Finding the Fourth Proportional to 66.91, 99.91 and 60.08

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Solution

The fourth proportional to 66.91, 99.91 and 60.08 is: 89.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.91 : 99.91 = 60.08 : x
  2. Step 2: Convert to fraction form
    66.91/99.91 = 60.08/x
  3. Step 3: Cross multiply
    66.91x = 99.91 × 60.08
  4. Step 4: Simplify right side
    66.91x = 6,002.59
  5. Step 5: Solve for x
    x = 6,002.59/66.91
  6. Step 6: Final answer
    x = 89.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.