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Finding the Fourth Proportional to 112.89, 155.62 and 81.71

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Solution

The fourth proportional to 112.89, 155.62 and 81.71 is: 112.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.89 : 155.62 = 81.71 : x
  2. Step 2: Convert to fraction form
    112.89/155.62 = 81.71/x
  3. Step 3: Cross multiply
    112.89x = 155.62 × 81.71
  4. Step 4: Simplify right side
    112.89x = 12,715.62
  5. Step 5: Solve for x
    x = 12,715.62/112.89
  6. Step 6: Final answer
    x = 112.63

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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.