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Finding the Fourth Proportional to 112.91, 155.72 and 85.11

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Solution

The fourth proportional to 112.91, 155.72 and 85.11 is: 117.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.91 : 155.72 = 85.11 : x
  2. Step 2: Convert to fraction form
    112.91/155.72 = 85.11/x
  3. Step 3: Cross multiply
    112.91x = 155.72 × 85.11
  4. Step 4: Simplify right side
    112.91x = 13,252.90
  5. Step 5: Solve for x
    x = 13,252.90/112.91
  6. Step 6: Final answer
    x = 117.38

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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.