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Finding the Fourth Proportional to 725.80, 1,088.78 and 263.79

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Solution

The fourth proportional to 725.80, 1,088.78 and 263.79 is: 395.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.80 : 1,088.78 = 263.79 : x
  2. Step 2: Convert to fraction form
    725.80/1,088.78 = 263.79/x
  3. Step 3: Cross multiply
    725.80x = 1,088.78 × 263.79
  4. Step 4: Simplify right side
    725.80x = 287,207.96
  5. Step 5: Solve for x
    x = 287,207.96/725.80
  6. Step 6: Final answer
    x = 395.71

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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.