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Finding the Fourth Proportional to 115.31, 173.23 and 99.65

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Solution

The fourth proportional to 115.31, 173.23 and 99.65 is: 149.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.31 : 173.23 = 99.65 : x
  2. Step 2: Convert to fraction form
    115.31/173.23 = 99.65/x
  3. Step 3: Cross multiply
    115.31x = 173.23 × 99.65
  4. Step 4: Simplify right side
    115.31x = 17,261.25
  5. Step 5: Solve for x
    x = 17,261.25/115.31
  6. Step 6: Final answer
    x = 149.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.