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Finding the Fourth Proportional to 725.39, 1,088.29 and 238.78

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Solution

The fourth proportional to 725.39, 1,088.29 and 238.78 is: 358.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.39 : 1,088.29 = 238.78 : x
  2. Step 2: Convert to fraction form
    725.39/1,088.29 = 238.78/x
  3. Step 3: Cross multiply
    725.39x = 1,088.29 × 238.78
  4. Step 4: Simplify right side
    725.39x = 259,861.89
  5. Step 5: Solve for x
    x = 259,861.89/725.39
  6. Step 6: Final answer
    x = 358.24

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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.