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Finding the Fourth Proportional to 115.35, 158.99 and 80.39

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Solution

The fourth proportional to 115.35, 158.99 and 80.39 is: 110.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.35 : 158.99 = 80.39 : x
  2. Step 2: Convert to fraction form
    115.35/158.99 = 80.39/x
  3. Step 3: Cross multiply
    115.35x = 158.99 × 80.39
  4. Step 4: Simplify right side
    115.35x = 12,780.01
  5. Step 5: Solve for x
    x = 12,780.01/115.35
  6. Step 6: Final answer
    x = 110.79

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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.