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Finding the Fourth Proportional to 726.42, 1,089.54 and 379.56

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Solution

The fourth proportional to 726.42, 1,089.54 and 379.56 is: 569.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.42 : 1,089.54 = 379.56 : x
  2. Step 2: Convert to fraction form
    726.42/1,089.54 = 379.56/x
  3. Step 3: Cross multiply
    726.42x = 1,089.54 × 379.56
  4. Step 4: Simplify right side
    726.42x = 413,545.80
  5. Step 5: Solve for x
    x = 413,545.80/726.42
  6. Step 6: Final answer
    x = 569.29

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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.