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Finding the Fourth Proportional to 115.92, 160.00 and 86.42

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Solution

The fourth proportional to 115.92, 160.00 and 86.42 is: 119.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.92 : 160.00 = 86.42 : x
  2. Step 2: Convert to fraction form
    115.92/160.00 = 86.42/x
  3. Step 3: Cross multiply
    115.92x = 160.00 × 86.42
  4. Step 4: Simplify right side
    115.92x = 13,826.73
  5. Step 5: Solve for x
    x = 13,826.73/115.92
  6. Step 6: Final answer
    x = 119.28

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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.