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Finding the Fourth Proportional to 725.16, 1,005.09 and 713.43

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Solution

The fourth proportional to 725.16, 1,005.09 and 713.43 is: 988.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.16 : 1,005.09 = 713.43 : x
  2. Step 2: Convert to fraction form
    725.16/1,005.09 = 713.43/x
  3. Step 3: Cross multiply
    725.16x = 1,005.09 × 713.43
  4. Step 4: Simplify right side
    725.16x = 717,061.36
  5. Step 5: Solve for x
    x = 717,061.36/725.16
  6. Step 6: Final answer
    x = 988.83

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.