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Finding the Fourth Proportional to 725.68, 1,088.16 and 238.72

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Solution

The fourth proportional to 725.68, 1,088.16 and 238.72 is: 357.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.68 : 1,088.16 = 238.72 : x
  2. Step 2: Convert to fraction form
    725.68/1,088.16 = 238.72/x
  3. Step 3: Cross multiply
    725.68x = 1,088.16 × 238.72
  4. Step 4: Simplify right side
    725.68x = 259,765.56
  5. Step 5: Solve for x
    x = 259,765.56/725.68
  6. Step 6: Final answer
    x = 357.96

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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.