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Finding the Fourth Proportional to 726.62, 1,089.30 and 521.42

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Solution

The fourth proportional to 726.62, 1,089.30 and 521.42 is: 781.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.62 : 1,089.30 = 521.42 : x
  2. Step 2: Convert to fraction form
    726.62/1,089.30 = 521.42/x
  3. Step 3: Cross multiply
    726.62x = 1,089.30 × 521.42
  4. Step 4: Simplify right side
    726.62x = 567,982.81
  5. Step 5: Solve for x
    x = 567,982.81/726.62
  6. Step 6: Final answer
    x = 781.68

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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.