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Finding the Fourth Proportional to 115.12, 171.60 and 113.36

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Solution

The fourth proportional to 115.12, 171.60 and 113.36 is: 168.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.12 : 171.60 = 113.36 : x
  2. Step 2: Convert to fraction form
    115.12/171.60 = 113.36/x
  3. Step 3: Cross multiply
    115.12x = 171.60 × 113.36
  4. Step 4: Simplify right side
    115.12x = 19,452.58
  5. Step 5: Solve for x
    x = 19,452.58/115.12
  6. Step 6: Final answer
    x = 168.98

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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.