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Finding the Fourth Proportional to 725.67, 1,089.61 and 453.48

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Solution

The fourth proportional to 725.67, 1,089.61 and 453.48 is: 680.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.67 : 1,089.61 = 453.48 : x
  2. Step 2: Convert to fraction form
    725.67/1,089.61 = 453.48/x
  3. Step 3: Cross multiply
    725.67x = 1,089.61 × 453.48
  4. Step 4: Simplify right side
    725.67x = 494,110.89
  5. Step 5: Solve for x
    x = 494,110.89/725.67
  6. Step 6: Final answer
    x = 680.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.