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Finding the Fourth Proportional to 100.85, 151.28 and 28.71

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Solution

The fourth proportional to 100.85, 151.28 and 28.71 is: 43.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.85 : 151.28 = 28.71 : x
  2. Step 2: Convert to fraction form
    100.85/151.28 = 28.71/x
  3. Step 3: Cross multiply
    100.85x = 151.28 × 28.71
  4. Step 4: Simplify right side
    100.85x = 4,343.11
  5. Step 5: Solve for x
    x = 4,343.11/100.85
  6. Step 6: Final answer
    x = 43.06

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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.