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Finding the Fourth Proportional to 726.40, 1,089.08 and 360.42

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Solution

The fourth proportional to 726.40, 1,089.08 and 360.42 is: 540.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.40 : 1,089.08 = 360.42 : x
  2. Step 2: Convert to fraction form
    726.40/1,089.08 = 360.42/x
  3. Step 3: Cross multiply
    726.40x = 1,089.08 × 360.42
  4. Step 4: Simplify right side
    726.40x = 392,526.21
  5. Step 5: Solve for x
    x = 392,526.21/726.40
  6. Step 6: Final answer
    x = 540.37

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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.