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Finding the Fourth Proportional to 726.74, 1,089.98 and 239.78

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Solution

The fourth proportional to 726.74, 1,089.98 and 239.78 is: 359.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.74 : 1,089.98 = 239.78 : x
  2. Step 2: Convert to fraction form
    726.74/1,089.98 = 239.78/x
  3. Step 3: Cross multiply
    726.74x = 1,089.98 × 239.78
  4. Step 4: Simplify right side
    726.74x = 261,355.40
  5. Step 5: Solve for x
    x = 261,355.40/726.74
  6. Step 6: Final answer
    x = 359.63

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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.