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Finding the Fourth Proportional to 799.20, 1,102.08 and 781.32

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Solution

The fourth proportional to 799.20, 1,102.08 and 781.32 is: 1,077.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.20 : 1,102.08 = 781.32 : x
  2. Step 2: Convert to fraction form
    799.20/1,102.08 = 781.32/x
  3. Step 3: Cross multiply
    799.20x = 1,102.08 × 781.32
  4. Step 4: Simplify right side
    799.20x = 861,077.15
  5. Step 5: Solve for x
    x = 861,077.15/799.20
  6. Step 6: Final answer
    x = 1,077.42

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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.