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Finding the Fourth Proportional to 726.17, 1,089.29 and 239.21

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Solution

The fourth proportional to 726.17, 1,089.29 and 239.21 is: 358.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.17 : 1,089.29 = 239.21 : x
  2. Step 2: Convert to fraction form
    726.17/1,089.29 = 239.21/x
  3. Step 3: Cross multiply
    726.17x = 1,089.29 × 239.21
  4. Step 4: Simplify right side
    726.17x = 260,569.06
  5. Step 5: Solve for x
    x = 260,569.06/726.17
  6. Step 6: Final answer
    x = 358.83

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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.