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Finding the Fourth Proportional to 725.36, 1,000.98 and 393.76

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Solution

The fourth proportional to 725.36, 1,000.98 and 393.76 is: 543.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.36 : 1,000.98 = 393.76 : x
  2. Step 2: Convert to fraction form
    725.36/1,000.98 = 393.76/x
  3. Step 3: Cross multiply
    725.36x = 1,000.98 × 393.76
  4. Step 4: Simplify right side
    725.36x = 394,145.88
  5. Step 5: Solve for x
    x = 394,145.88/725.36
  6. Step 6: Final answer
    x = 543.38

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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.