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Finding the Fourth Proportional to 772.80, 1,067.20 and 726.40

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Solution

The fourth proportional to 772.80, 1,067.20 and 726.40 is: 1,003.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.80 : 1,067.20 = 726.40 : x
  2. Step 2: Convert to fraction form
    772.80/1,067.20 = 726.40/x
  3. Step 3: Cross multiply
    772.80x = 1,067.20 × 726.40
  4. Step 4: Simplify right side
    772.80x = 775,214.08
  5. Step 5: Solve for x
    x = 775,214.08/772.80
  6. Step 6: Final answer
    x = 1,003.12

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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.