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Finding the Fourth Proportional to 112.32, 155.79 and 106.38

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Solution

The fourth proportional to 112.32, 155.79 and 106.38 is: 147.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.32 : 155.79 = 106.38 : x
  2. Step 2: Convert to fraction form
    112.32/155.79 = 106.38/x
  3. Step 3: Cross multiply
    112.32x = 155.79 × 106.38
  4. Step 4: Simplify right side
    112.32x = 16,572.94
  5. Step 5: Solve for x
    x = 16,572.94/112.32
  6. Step 6: Final answer
    x = 147.55

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.