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Finding the Fourth Proportional to 725.05, 1,000.56 and 393.48

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Solution

The fourth proportional to 725.05, 1,000.56 and 393.48 is: 542.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.05 : 1,000.56 = 393.48 : x
  2. Step 2: Convert to fraction form
    725.05/1,000.56 = 393.48/x
  3. Step 3: Cross multiply
    725.05x = 1,000.56 × 393.48
  4. Step 4: Simplify right side
    725.05x = 393,693.38
  5. Step 5: Solve for x
    x = 393,693.38/725.05
  6. Step 6: Final answer
    x = 542.99

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Double scale
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1.5x scale

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.