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Finding the Fourth Proportional to 113.28, 156.67 and 100.97

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Solution

The fourth proportional to 113.28, 156.67 and 100.97 is: 139.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.28 : 156.67 = 100.97 : x
  2. Step 2: Convert to fraction form
    113.28/156.67 = 100.97/x
  3. Step 3: Cross multiply
    113.28x = 156.67 × 100.97
  4. Step 4: Simplify right side
    113.28x = 15,819.40
  5. Step 5: Solve for x
    x = 15,819.40/113.28
  6. Step 6: Final answer
    x = 139.65

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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.