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Finding the Fourth Proportional to 113.32, 168.89 and 109.90

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Solution

The fourth proportional to 113.32, 168.89 and 109.90 is: 163.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.32 : 168.89 = 109.90 : x
  2. Step 2: Convert to fraction form
    113.32/168.89 = 109.90/x
  3. Step 3: Cross multiply
    113.32x = 168.89 × 109.90
  4. Step 4: Simplify right side
    113.32x = 18,561.01
  5. Step 5: Solve for x
    x = 18,561.01/113.32
  6. Step 6: Final answer
    x = 163.79

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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.