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Finding the Fourth Proportional to 112.17, 154.57 and 72.79

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Solution

The fourth proportional to 112.17, 154.57 and 72.79 is: 100.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.17 : 154.57 = 72.79 : x
  2. Step 2: Convert to fraction form
    112.17/154.57 = 72.79/x
  3. Step 3: Cross multiply
    112.17x = 154.57 × 72.79
  4. Step 4: Simplify right side
    112.17x = 11,251.15
  5. Step 5: Solve for x
    x = 11,251.15/112.17
  6. Step 6: Final answer
    x = 100.30

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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.