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Finding the Fourth Proportional to 100.85, 151.34 and 66.69

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Solution

The fourth proportional to 100.85, 151.34 and 66.69 is: 100.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.85 : 151.34 = 66.69 : x
  2. Step 2: Convert to fraction form
    100.85/151.34 = 66.69/x
  3. Step 3: Cross multiply
    100.85x = 151.34 × 66.69
  4. Step 4: Simplify right side
    100.85x = 10,092.53
  5. Step 5: Solve for x
    x = 10,092.53/100.85
  6. Step 6: Final answer
    x = 100.08

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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.