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Finding the Fourth Proportional to 113.80, 156.86 and 91.72

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Solution

The fourth proportional to 113.80, 156.86 and 91.72 is: 126.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.80 : 156.86 = 91.72 : x
  2. Step 2: Convert to fraction form
    113.80/156.86 = 91.72/x
  3. Step 3: Cross multiply
    113.80x = 156.86 × 91.72
  4. Step 4: Simplify right side
    113.80x = 14,387.20
  5. Step 5: Solve for x
    x = 14,387.20/113.80
  6. Step 6: Final answer
    x = 126.43

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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.