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Finding the Fourth Proportional to 726.26, 1,002.21 and 394.70

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Solution

The fourth proportional to 726.26, 1,002.21 and 394.70 is: 544.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.26 : 1,002.21 = 394.70 : x
  2. Step 2: Convert to fraction form
    726.26/1,002.21 = 394.70/x
  3. Step 3: Cross multiply
    726.26x = 1,002.21 × 394.70
  4. Step 4: Simplify right side
    726.26x = 395,567.28
  5. Step 5: Solve for x
    x = 395,567.28/726.26
  6. Step 6: Final answer
    x = 544.67

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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.