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Finding the Fourth Proportional to 73.20, 100.99 and 66.27

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Solution

The fourth proportional to 73.20, 100.99 and 66.27 is: 91.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.20 : 100.99 = 66.27 : x
  2. Step 2: Convert to fraction form
    73.20/100.99 = 66.27/x
  3. Step 3: Cross multiply
    73.20x = 100.99 × 66.27
  4. Step 4: Simplify right side
    73.20x = 6,691.77
  5. Step 5: Solve for x
    x = 6,691.77/73.20
  6. Step 6: Final answer
    x = 91.42

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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.