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Finding the Fourth Proportional to 115.91, 173.51 and 86.85

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Solution

The fourth proportional to 115.91, 173.51 and 86.85 is: 130.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.91 : 173.51 = 86.85 : x
  2. Step 2: Convert to fraction form
    115.91/173.51 = 86.85/x
  3. Step 3: Cross multiply
    115.91x = 173.51 × 86.85
  4. Step 4: Simplify right side
    115.91x = 15,069.23
  5. Step 5: Solve for x
    x = 15,069.23/115.91
  6. Step 6: Final answer
    x = 130.01

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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.