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Finding the Fourth Proportional to 725.91, 1,089.14 and 437.55

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Solution

The fourth proportional to 725.91, 1,089.14 and 437.55 is: 656.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.91 : 1,089.14 = 437.55 : x
  2. Step 2: Convert to fraction form
    725.91/1,089.14 = 437.55/x
  3. Step 3: Cross multiply
    725.91x = 1,089.14 × 437.55
  4. Step 4: Simplify right side
    725.91x = 476,551.02
  5. Step 5: Solve for x
    x = 476,551.02/725.91
  6. Step 6: Final answer
    x = 656.49

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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.