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Finding the Fourth Proportional to 726.56, 1,089.78 and 239.45

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Solution

The fourth proportional to 726.56, 1,089.78 and 239.45 is: 359.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.56 : 1,089.78 = 239.45 : x
  2. Step 2: Convert to fraction form
    726.56/1,089.78 = 239.45/x
  3. Step 3: Cross multiply
    726.56x = 1,089.78 × 239.45
  4. Step 4: Simplify right side
    726.56x = 260,942.37
  5. Step 5: Solve for x
    x = 260,942.37/726.56
  6. Step 6: Final answer
    x = 359.15

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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.