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Finding the Fourth Proportional to 113.88, 156.87 and 82.71

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Solution

The fourth proportional to 113.88, 156.87 and 82.71 is: 113.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.88 : 156.87 = 82.71 : x
  2. Step 2: Convert to fraction form
    113.88/156.87 = 82.71/x
  3. Step 3: Cross multiply
    113.88x = 156.87 × 82.71
  4. Step 4: Simplify right side
    113.88x = 12,974.72
  5. Step 5: Solve for x
    x = 12,974.72/113.88
  6. Step 6: Final answer
    x = 113.93

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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.