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Finding the Fourth Proportional to 112.73, 155.85 and 85.05

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Solution

The fourth proportional to 112.73, 155.85 and 85.05 is: 117.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.73 : 155.85 = 85.05 : x
  2. Step 2: Convert to fraction form
    112.73/155.85 = 85.05/x
  3. Step 3: Cross multiply
    112.73x = 155.85 × 85.05
  4. Step 4: Simplify right side
    112.73x = 13,255.04
  5. Step 5: Solve for x
    x = 13,255.04/112.73
  6. Step 6: Final answer
    x = 117.59

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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.