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Finding the Fourth Proportional to 726.56, 1,002.65 and 394.99

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Solution

The fourth proportional to 726.56, 1,002.65 and 394.99 is: 545.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.56 : 1,002.65 = 394.99 : x
  2. Step 2: Convert to fraction form
    726.56/1,002.65 = 394.99/x
  3. Step 3: Cross multiply
    726.56x = 1,002.65 × 394.99
  4. Step 4: Simplify right side
    726.56x = 396,032.24
  5. Step 5: Solve for x
    x = 396,032.24/726.56
  6. Step 6: Final answer
    x = 545.08

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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.