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Finding the Fourth Proportional to 725.48, 1,087.92 and 238.40

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Solution

The fourth proportional to 725.48, 1,087.92 and 238.40 is: 357.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.48 : 1,087.92 = 238.40 : x
  2. Step 2: Convert to fraction form
    725.48/1,087.92 = 238.40/x
  3. Step 3: Cross multiply
    725.48x = 1,087.92 × 238.40
  4. Step 4: Simplify right side
    725.48x = 259,360.13
  5. Step 5: Solve for x
    x = 259,360.13/725.48
  6. Step 6: Final answer
    x = 357.50

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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.