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Finding the Fourth Proportional to 112.17, 154.40 and 107.31

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Solution

The fourth proportional to 112.17, 154.40 and 107.31 is: 147.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.17 : 154.40 = 107.31 : x
  2. Step 2: Convert to fraction form
    112.17/154.40 = 107.31/x
  3. Step 3: Cross multiply
    112.17x = 154.40 × 107.31
  4. Step 4: Simplify right side
    112.17x = 16,568.13
  5. Step 5: Solve for x
    x = 16,568.13/112.17
  6. Step 6: Final answer
    x = 147.71

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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.