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Finding the Fourth Proportional to 115.85, 159.75 and 86.69

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Solution

The fourth proportional to 115.85, 159.75 and 86.69 is: 119.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.85 : 159.75 = 86.69 : x
  2. Step 2: Convert to fraction form
    115.85/159.75 = 86.69/x
  3. Step 3: Cross multiply
    115.85x = 159.75 × 86.69
  4. Step 4: Simplify right side
    115.85x = 13,847.93
  5. Step 5: Solve for x
    x = 13,847.93/115.85
  6. Step 6: Final answer
    x = 119.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.