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Finding the Fourth Proportional to 115.91, 160.05 and 89.65

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Solution

The fourth proportional to 115.91, 160.05 and 89.65 is: 123.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.91 : 160.05 = 89.65 : x
  2. Step 2: Convert to fraction form
    115.91/160.05 = 89.65/x
  3. Step 3: Cross multiply
    115.91x = 160.05 × 89.65
  4. Step 4: Simplify right side
    115.91x = 14,348.08
  5. Step 5: Solve for x
    x = 14,348.08/115.91
  6. Step 6: Final answer
    x = 123.78

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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.