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Finding the Fourth Proportional to 112.24, 154.68 and 81.22

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Solution

The fourth proportional to 112.24, 154.68 and 81.22 is: 111.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.24 : 154.68 = 81.22 : x
  2. Step 2: Convert to fraction form
    112.24/154.68 = 81.22/x
  3. Step 3: Cross multiply
    112.24x = 154.68 × 81.22
  4. Step 4: Simplify right side
    112.24x = 12,563.11
  5. Step 5: Solve for x
    x = 12,563.11/112.24
  6. Step 6: Final answer
    x = 111.93

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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.