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Finding the Fourth Proportional to 717.69, 991.76 and 611.33

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Solution

The fourth proportional to 717.69, 991.76 and 611.33 is: 844.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.69 : 991.76 = 611.33 : x
  2. Step 2: Convert to fraction form
    717.69/991.76 = 611.33/x
  3. Step 3: Cross multiply
    717.69x = 991.76 × 611.33
  4. Step 4: Simplify right side
    717.69x = 606,292.04
  5. Step 5: Solve for x
    x = 606,292.04/717.69
  6. Step 6: Final answer
    x = 844.79

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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.