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Finding the Fourth Proportional to 726.36, 1,089.71 and 239.41

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Solution

The fourth proportional to 726.36, 1,089.71 and 239.41 is: 359.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.36 : 1,089.71 = 239.41 : x
  2. Step 2: Convert to fraction form
    726.36/1,089.71 = 239.41/x
  3. Step 3: Cross multiply
    726.36x = 1,089.71 × 239.41
  4. Step 4: Simplify right side
    726.36x = 260,887.47
  5. Step 5: Solve for x
    x = 260,887.47/726.36
  6. Step 6: Final answer
    x = 359.17

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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.