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Finding the Fourth Proportional to 726.98, 1,003.21 and 395.40

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Solution

The fourth proportional to 726.98, 1,003.21 and 395.40 is: 545.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.98 : 1,003.21 = 395.40 : x
  2. Step 2: Convert to fraction form
    726.98/1,003.21 = 395.40/x
  3. Step 3: Cross multiply
    726.98x = 1,003.21 × 395.40
  4. Step 4: Simplify right side
    726.98x = 396,667.48
  5. Step 5: Solve for x
    x = 396,667.48/726.98
  6. Step 6: Final answer
    x = 545.64

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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.