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Finding the Fourth Proportional to 726.90, 1,003.41 and 611.70

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Solution

The fourth proportional to 726.90, 1,003.41 and 611.70 is: 844.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.90 : 1,003.41 = 611.70 : x
  2. Step 2: Convert to fraction form
    726.90/1,003.41 = 611.70/x
  3. Step 3: Cross multiply
    726.90x = 1,003.41 × 611.70
  4. Step 4: Simplify right side
    726.90x = 613,785.90
  5. Step 5: Solve for x
    x = 613,785.90/726.90
  6. Step 6: Final answer
    x = 844.39

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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.