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Finding the Fourth Proportional to 112.11, 154.62 and 101.31

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Solution

The fourth proportional to 112.11, 154.62 and 101.31 is: 139.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.11 : 154.62 = 101.31 : x
  2. Step 2: Convert to fraction form
    112.11/154.62 = 101.31/x
  3. Step 3: Cross multiply
    112.11x = 154.62 × 101.31
  4. Step 4: Simplify right side
    112.11x = 15,664.55
  5. Step 5: Solve for x
    x = 15,664.55/112.11
  6. Step 6: Final answer
    x = 139.72

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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.