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Finding the Fourth Proportional to 725.78, 1,088.72 and 238.84

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Solution

The fourth proportional to 725.78, 1,088.72 and 238.84 is: 358.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.78 : 1,088.72 = 238.84 : x
  2. Step 2: Convert to fraction form
    725.78/1,088.72 = 238.84/x
  3. Step 3: Cross multiply
    725.78x = 1,088.72 × 238.84
  4. Step 4: Simplify right side
    725.78x = 260,029.88
  5. Step 5: Solve for x
    x = 260,029.88/725.78
  6. Step 6: Final answer
    x = 358.28

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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.