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Finding the Fourth Proportional to 726.43, 1,089.89 and 239.56

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Solution

The fourth proportional to 726.43, 1,089.89 and 239.56 is: 359.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.43 : 1,089.89 = 239.56 : x
  2. Step 2: Convert to fraction form
    726.43/1,089.89 = 239.56/x
  3. Step 3: Cross multiply
    726.43x = 1,089.89 × 239.56
  4. Step 4: Simplify right side
    726.43x = 261,094.05
  5. Step 5: Solve for x
    x = 261,094.05/726.43
  6. Step 6: Final answer
    x = 359.42

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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.