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Finding the Fourth Proportional to 103.28, 154.87 and 66.71

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Solution

The fourth proportional to 103.28, 154.87 and 66.71 is: 100.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.28 : 154.87 = 66.71 : x
  2. Step 2: Convert to fraction form
    103.28/154.87 = 66.71/x
  3. Step 3: Cross multiply
    103.28x = 154.87 × 66.71
  4. Step 4: Simplify right side
    103.28x = 10,331.60
  5. Step 5: Solve for x
    x = 10,331.60/103.28
  6. Step 6: Final answer
    x = 100.04

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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.