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Finding the Fourth Proportional to 726.39, 1,089.72 and 239.79

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Solution

The fourth proportional to 726.39, 1,089.72 and 239.79 is: 359.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.39 : 1,089.72 = 239.79 : x
  2. Step 2: Convert to fraction form
    726.39/1,089.72 = 239.79/x
  3. Step 3: Cross multiply
    726.39x = 1,089.72 × 239.79
  4. Step 4: Simplify right side
    726.39x = 261,303.96
  5. Step 5: Solve for x
    x = 261,303.96/726.39
  6. Step 6: Final answer
    x = 359.73

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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.