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Finding the Fourth Proportional to 726.32, 1,089.60 and 239.25

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Solution

The fourth proportional to 726.32, 1,089.60 and 239.25 is: 358.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.32 : 1,089.60 = 239.25 : x
  2. Step 2: Convert to fraction form
    726.32/1,089.60 = 239.25/x
  3. Step 3: Cross multiply
    726.32x = 1,089.60 × 239.25
  4. Step 4: Simplify right side
    726.32x = 260,686.80
  5. Step 5: Solve for x
    x = 260,686.80/726.32
  6. Step 6: Final answer
    x = 358.91

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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.