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Finding the Fourth Proportional to 775.20, 1,162.80 and 679.20

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Solution

The fourth proportional to 775.20, 1,162.80 and 679.20 is: 1,018.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.20 : 1,162.80 = 679.20 : x
  2. Step 2: Convert to fraction form
    775.20/1,162.80 = 679.20/x
  3. Step 3: Cross multiply
    775.20x = 1,162.80 × 679.20
  4. Step 4: Simplify right side
    775.20x = 789,773.76
  5. Step 5: Solve for x
    x = 789,773.76/775.20
  6. Step 6: Final answer
    x = 1,018.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.