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Finding the Fourth Proportional to 112.06, 154.42 and 79.21

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Solution

The fourth proportional to 112.06, 154.42 and 79.21 is: 109.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.06 : 154.42 = 79.21 : x
  2. Step 2: Convert to fraction form
    112.06/154.42 = 79.21/x
  3. Step 3: Cross multiply
    112.06x = 154.42 × 79.21
  4. Step 4: Simplify right side
    112.06x = 12,231.61
  5. Step 5: Solve for x
    x = 12,231.61/112.06
  6. Step 6: Final answer
    x = 109.15

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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.