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Finding the Fourth Proportional to 112.33, 168.71 and 85.43

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Solution

The fourth proportional to 112.33, 168.71 and 85.43 is: 128.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.33 : 168.71 = 85.43 : x
  2. Step 2: Convert to fraction form
    112.33/168.71 = 85.43/x
  3. Step 3: Cross multiply
    112.33x = 168.71 × 85.43
  4. Step 4: Simplify right side
    112.33x = 14,412.90
  5. Step 5: Solve for x
    x = 14,412.90/112.33
  6. Step 6: Final answer
    x = 128.31

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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.