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Finding the Fourth Proportional to 115.12, 171.85 and 108.04

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Solution

The fourth proportional to 115.12, 171.85 and 108.04 is: 161.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.12 : 171.85 = 108.04 : x
  2. Step 2: Convert to fraction form
    115.12/171.85 = 108.04/x
  3. Step 3: Cross multiply
    115.12x = 171.85 × 108.04
  4. Step 4: Simplify right side
    115.12x = 18,566.67
  5. Step 5: Solve for x
    x = 18,566.67/115.12
  6. Step 6: Final answer
    x = 161.28

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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.