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Finding the Fourth Proportional to 789.60, 1,177.92 and 679.20

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Solution

The fourth proportional to 789.60, 1,177.92 and 679.20 is: 1,013.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.60 : 1,177.92 = 679.20 : x
  2. Step 2: Convert to fraction form
    789.60/1,177.92 = 679.20/x
  3. Step 3: Cross multiply
    789.60x = 1,177.92 × 679.20
  4. Step 4: Simplify right side
    789.60x = 800,043.26
  5. Step 5: Solve for x
    x = 800,043.26/789.60
  6. Step 6: Final answer
    x = 1,013.23

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.