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Finding the Fourth Proportional to 259.97, 390.09 and 115.66

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Solution

The fourth proportional to 259.97, 390.09 and 115.66 is: 173.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.97 : 390.09 = 115.66 : x
  2. Step 2: Convert to fraction form
    259.97/390.09 = 115.66/x
  3. Step 3: Cross multiply
    259.97x = 390.09 × 115.66
  4. Step 4: Simplify right side
    259.97x = 45,115.86
  5. Step 5: Solve for x
    x = 45,115.86/259.97
  6. Step 6: Final answer
    x = 173.54

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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.