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Finding the Fourth Proportional to 725.11, 1,000.64 and 393.53

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Solution

The fourth proportional to 725.11, 1,000.64 and 393.53 is: 543.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.11 : 1,000.64 = 393.53 : x
  2. Step 2: Convert to fraction form
    725.11/1,000.64 = 393.53/x
  3. Step 3: Cross multiply
    725.11x = 1,000.64 × 393.53
  4. Step 4: Simplify right side
    725.11x = 393,781.86
  5. Step 5: Solve for x
    x = 393,781.86/725.11
  6. Step 6: Final answer
    x = 543.07

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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.