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Finding the Fourth Proportional to 773.28, 1,067.22 and 642.06

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Solution

The fourth proportional to 773.28, 1,067.22 and 642.06 is: 886.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    773.28 : 1,067.22 = 642.06 : x
  2. Step 2: Convert to fraction form
    773.28/1,067.22 = 642.06/x
  3. Step 3: Cross multiply
    773.28x = 1,067.22 × 642.06
  4. Step 4: Simplify right side
    773.28x = 685,219.27
  5. Step 5: Solve for x
    x = 685,219.27/773.28
  6. Step 6: Final answer
    x = 886.12

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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.