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Finding the Fourth Proportional to 726.21, 1,002.20 and 394.66

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Solution

The fourth proportional to 726.21, 1,002.20 and 394.66 is: 544.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.21 : 1,002.20 = 394.66 : x
  2. Step 2: Convert to fraction form
    726.21/1,002.20 = 394.66/x
  3. Step 3: Cross multiply
    726.21x = 1,002.20 × 394.66
  4. Step 4: Simplify right side
    726.21x = 395,527.53
  5. Step 5: Solve for x
    x = 395,527.53/726.21
  6. Step 6: Final answer
    x = 544.65

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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.