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Finding the Fourth Proportional to 115.12, 171.72 and 100.85

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Solution

The fourth proportional to 115.12, 171.72 and 100.85 is: 150.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.12 : 171.72 = 100.85 : x
  2. Step 2: Convert to fraction form
    115.12/171.72 = 100.85/x
  3. Step 3: Cross multiply
    115.12x = 171.72 × 100.85
  4. Step 4: Simplify right side
    115.12x = 17,317.10
  5. Step 5: Solve for x
    x = 17,317.10/115.12
  6. Step 6: Final answer
    x = 150.42

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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.