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Finding the Fourth Proportional to 113.20, 156.23 and 66.57

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Solution

The fourth proportional to 113.20, 156.23 and 66.57 is: 91.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.20 : 156.23 = 66.57 : x
  2. Step 2: Convert to fraction form
    113.20/156.23 = 66.57/x
  3. Step 3: Cross multiply
    113.20x = 156.23 × 66.57
  4. Step 4: Simplify right side
    113.20x = 10,400.29
  5. Step 5: Solve for x
    x = 10,400.29/113.20
  6. Step 6: Final answer
    x = 91.88

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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.