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Finding the Fourth Proportional to 991.41, 1,366.56 and 781.25

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Solution

The fourth proportional to 991.41, 1,366.56 and 781.25 is: 1,076.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.41 : 1,366.56 = 781.25 : x
  2. Step 2: Convert to fraction form
    991.41/1,366.56 = 781.25/x
  3. Step 3: Cross multiply
    991.41x = 1,366.56 × 781.25
  4. Step 4: Simplify right side
    991.41x = 1,067,621.10
  5. Step 5: Solve for x
    x = 1,067,621.10/991.41
  6. Step 6: Final answer
    x = 1,076.87

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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.