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Finding the Fourth Proportional to 112.56, 155.13 and 79.76

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Solution

The fourth proportional to 112.56, 155.13 and 79.76 is: 109.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.56 : 155.13 = 79.76 : x
  2. Step 2: Convert to fraction form
    112.56/155.13 = 79.76/x
  3. Step 3: Cross multiply
    112.56x = 155.13 × 79.76
  4. Step 4: Simplify right side
    112.56x = 12,373.17
  5. Step 5: Solve for x
    x = 12,373.17/112.56
  6. Step 6: Final answer
    x = 109.93

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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.