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Finding the Fourth Proportional to 115.45, 173.08 and 91.33

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Solution

The fourth proportional to 115.45, 173.08 and 91.33 is: 136.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.45 : 173.08 = 91.33 : x
  2. Step 2: Convert to fraction form
    115.45/173.08 = 91.33/x
  3. Step 3: Cross multiply
    115.45x = 173.08 × 91.33
  4. Step 4: Simplify right side
    115.45x = 15,807.40
  5. Step 5: Solve for x
    x = 15,807.40/115.45
  6. Step 6: Final answer
    x = 136.92

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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.