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Finding the Fourth Proportional to 726.40, 1,089.70 and 239.40

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Solution

The fourth proportional to 726.40, 1,089.70 and 239.40 is: 359.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.40 : 1,089.70 = 239.40 : x
  2. Step 2: Convert to fraction form
    726.40/1,089.70 = 239.40/x
  3. Step 3: Cross multiply
    726.40x = 1,089.70 × 239.40
  4. Step 4: Simplify right side
    726.40x = 260,874.18
  5. Step 5: Solve for x
    x = 260,874.18/726.40
  6. Step 6: Final answer
    x = 359.13

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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.