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Finding the Fourth Proportional to 112.56, 155.16 and 79.74

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Solution

The fourth proportional to 112.56, 155.16 and 79.74 is: 109.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.56 : 155.16 = 79.74 : x
  2. Step 2: Convert to fraction form
    112.56/155.16 = 79.74/x
  3. Step 3: Cross multiply
    112.56x = 155.16 × 79.74
  4. Step 4: Simplify right side
    112.56x = 12,372.46
  5. Step 5: Solve for x
    x = 12,372.46/112.56
  6. Step 6: Final answer
    x = 109.92

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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.