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Finding the Fourth Proportional to 111.28, 166.90 and 72.70

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Solution

The fourth proportional to 111.28, 166.90 and 72.70 is: 109.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.28 : 166.90 = 72.70 : x
  2. Step 2: Convert to fraction form
    111.28/166.90 = 72.70/x
  3. Step 3: Cross multiply
    111.28x = 166.90 × 72.70
  4. Step 4: Simplify right side
    111.28x = 12,133.63
  5. Step 5: Solve for x
    x = 12,133.63/111.28
  6. Step 6: Final answer
    x = 109.04

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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.