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Finding the Fourth Proportional to 112.31, 168.32 and 90.69

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Solution

The fourth proportional to 112.31, 168.32 and 90.69 is: 135.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.31 : 168.32 = 90.69 : x
  2. Step 2: Convert to fraction form
    112.31/168.32 = 90.69/x
  3. Step 3: Cross multiply
    112.31x = 168.32 × 90.69
  4. Step 4: Simplify right side
    112.31x = 15,264.49
  5. Step 5: Solve for x
    x = 15,264.49/112.31
  6. Step 6: Final answer
    x = 135.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.