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Finding the Fourth Proportional to 726.67, 1,002.79 and 395.08

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Solution

The fourth proportional to 726.67, 1,002.79 and 395.08 is: 545.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.67 : 1,002.79 = 395.08 : x
  2. Step 2: Convert to fraction form
    726.67/1,002.79 = 395.08/x
  3. Step 3: Cross multiply
    726.67x = 1,002.79 × 395.08
  4. Step 4: Simplify right side
    726.67x = 396,182.27
  5. Step 5: Solve for x
    x = 396,182.27/726.67
  6. Step 6: Final answer
    x = 545.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.