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Finding the Fourth Proportional to 115.78, 173.50 and 91.47

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Solution

The fourth proportional to 115.78, 173.50 and 91.47 is: 137.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.78 : 173.50 = 91.47 : x
  2. Step 2: Convert to fraction form
    115.78/173.50 = 91.47/x
  3. Step 3: Cross multiply
    115.78x = 173.50 × 91.47
  4. Step 4: Simplify right side
    115.78x = 15,869.49
  5. Step 5: Solve for x
    x = 15,869.49/115.78
  6. Step 6: Final answer
    x = 137.07

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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.