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Finding the Fourth Proportional to 991.20, 1,367.73 and 571.69

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Solution

The fourth proportional to 991.20, 1,367.73 and 571.69 is: 788.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.20 : 1,367.73 = 571.69 : x
  2. Step 2: Convert to fraction form
    991.20/1,367.73 = 571.69/x
  3. Step 3: Cross multiply
    991.20x = 1,367.73 × 571.69
  4. Step 4: Simplify right side
    991.20x = 781,910.73
  5. Step 5: Solve for x
    x = 781,910.73/991.20
  6. Step 6: Final answer
    x = 788.86

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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.