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Finding the Fourth Proportional to 721.26, 1,077.21 and 611.82

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Solution

The fourth proportional to 721.26, 1,077.21 and 611.82 is: 913.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.26 : 1,077.21 = 611.82 : x
  2. Step 2: Convert to fraction form
    721.26/1,077.21 = 611.82/x
  3. Step 3: Cross multiply
    721.26x = 1,077.21 × 611.82
  4. Step 4: Simplify right side
    721.26x = 659,058.62
  5. Step 5: Solve for x
    x = 659,058.62/721.26
  6. Step 6: Final answer
    x = 913.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.