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Finding the Fourth Proportional to 775.20, 1,067.40 and 656.40

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Solution

The fourth proportional to 775.20, 1,067.40 and 656.40 is: 903.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.20 : 1,067.40 = 656.40 : x
  2. Step 2: Convert to fraction form
    775.20/1,067.40 = 656.40/x
  3. Step 3: Cross multiply
    775.20x = 1,067.40 × 656.40
  4. Step 4: Simplify right side
    775.20x = 700,641.36
  5. Step 5: Solve for x
    x = 700,641.36/775.20
  6. Step 6: Final answer
    x = 903.82

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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.