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Finding the Fourth Proportional to 725.14, 1,000.69 and 393.57

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Solution

The fourth proportional to 725.14, 1,000.69 and 393.57 is: 543.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.14 : 1,000.69 = 393.57 : x
  2. Step 2: Convert to fraction form
    725.14/1,000.69 = 393.57/x
  3. Step 3: Cross multiply
    725.14x = 1,000.69 × 393.57
  4. Step 4: Simplify right side
    725.14x = 393,834.59
  5. Step 5: Solve for x
    x = 393,834.59/725.14
  6. Step 6: Final answer
    x = 543.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.