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Finding the Fourth Proportional to 66.20, 99.28 and 27.15

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Solution

The fourth proportional to 66.20, 99.28 and 27.15 is: 40.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.20 : 99.28 = 27.15 : x
  2. Step 2: Convert to fraction form
    66.20/99.28 = 27.15/x
  3. Step 3: Cross multiply
    66.20x = 99.28 × 27.15
  4. Step 4: Simplify right side
    66.20x = 2,695.70
  5. Step 5: Solve for x
    x = 2,695.70/66.20
  6. Step 6: Final answer
    x = 40.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.