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Finding the Fourth Proportional to 112.39, 155.05 and 68.71

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Solution

The fourth proportional to 112.39, 155.05 and 68.71 is: 94.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.39 : 155.05 = 68.71 : x
  2. Step 2: Convert to fraction form
    112.39/155.05 = 68.71/x
  3. Step 3: Cross multiply
    112.39x = 155.05 × 68.71
  4. Step 4: Simplify right side
    112.39x = 10,653.49
  5. Step 5: Solve for x
    x = 10,653.49/112.39
  6. Step 6: Final answer
    x = 94.79

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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.