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Finding the Fourth Proportional to 991.34, 1,367.78 and 565.97

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Solution

The fourth proportional to 991.34, 1,367.78 and 565.97 is: 780.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.34 : 1,367.78 = 565.97 : x
  2. Step 2: Convert to fraction form
    991.34/1,367.78 = 565.97/x
  3. Step 3: Cross multiply
    991.34x = 1,367.78 × 565.97
  4. Step 4: Simplify right side
    991.34x = 774,112.78
  5. Step 5: Solve for x
    x = 774,112.78/991.34
  6. Step 6: Final answer
    x = 780.88

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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.