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Finding the Fourth Proportional to 166.28, 229.41 and 100.80

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Solution

The fourth proportional to 166.28, 229.41 and 100.80 is: 139.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.28 : 229.41 = 100.80 : x
  2. Step 2: Convert to fraction form
    166.28/229.41 = 100.80/x
  3. Step 3: Cross multiply
    166.28x = 229.41 × 100.80
  4. Step 4: Simplify right side
    166.28x = 23,124.53
  5. Step 5: Solve for x
    x = 23,124.53/166.28
  6. Step 6: Final answer
    x = 139.07

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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.