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Finding the Fourth Proportional to 166.28, 229.55 and 100.76

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Solution

The fourth proportional to 166.28, 229.55 and 100.76 is: 139.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.28 : 229.55 = 100.76 : x
  2. Step 2: Convert to fraction form
    166.28/229.55 = 100.76/x
  3. Step 3: Cross multiply
    166.28x = 229.55 × 100.76
  4. Step 4: Simplify right side
    166.28x = 23,127.81
  5. Step 5: Solve for x
    x = 23,127.81/166.28
  6. Step 6: Final answer
    x = 139.09

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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.