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Finding the Fourth Proportional to 113.13, 168.50 and 111.78

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Solution

The fourth proportional to 113.13, 168.50 and 111.78 is: 166.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.13 : 168.50 = 111.78 : x
  2. Step 2: Convert to fraction form
    113.13/168.50 = 111.78/x
  3. Step 3: Cross multiply
    113.13x = 168.50 × 111.78
  4. Step 4: Simplify right side
    113.13x = 18,834.58
  5. Step 5: Solve for x
    x = 18,834.58/113.13
  6. Step 6: Final answer
    x = 166.49

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.