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Finding the Fourth Proportional to 725.74, 1,088.49 and 238.80

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Solution

The fourth proportional to 725.74, 1,088.49 and 238.80 is: 358.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.74 : 1,088.49 = 238.80 : x
  2. Step 2: Convert to fraction form
    725.74/1,088.49 = 238.80/x
  3. Step 3: Cross multiply
    725.74x = 1,088.49 × 238.80
  4. Step 4: Simplify right side
    725.74x = 259,925.97
  5. Step 5: Solve for x
    x = 259,925.97/725.74
  6. Step 6: Final answer
    x = 358.15

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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.