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Finding the Fourth Proportional to 113.78, 170.85 and 111.62

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Solution

The fourth proportional to 113.78, 170.85 and 111.62 is: 167.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.78 : 170.85 = 111.62 : x
  2. Step 2: Convert to fraction form
    113.78/170.85 = 111.62/x
  3. Step 3: Cross multiply
    113.78x = 170.85 × 111.62
  4. Step 4: Simplify right side
    113.78x = 19,070.28
  5. Step 5: Solve for x
    x = 19,070.28/113.78
  6. Step 6: Final answer
    x = 167.61

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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.