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Finding the Fourth Proportional to 66.54, 99.28 and 60.66

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Solution

The fourth proportional to 66.54, 99.28 and 60.66 is: 90.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.54 : 99.28 = 60.66 : x
  2. Step 2: Convert to fraction form
    66.54/99.28 = 60.66/x
  3. Step 3: Cross multiply
    66.54x = 99.28 × 60.66
  4. Step 4: Simplify right side
    66.54x = 6,022.32
  5. Step 5: Solve for x
    x = 6,022.32/66.54
  6. Step 6: Final answer
    x = 90.51

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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.