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Finding the Fourth Proportional to 6,921.90, 9,601.20 and 6,672.87

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Solution

The fourth proportional to 6,921.90, 9,601.20 and 6,672.87 is: 9,255.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,921.90 : 9,601.20 = 6,672.87 : x
  2. Step 2: Convert to fraction form
    6,921.90/9,601.20 = 6,672.87/x
  3. Step 3: Cross multiply
    6,921.90x = 9,601.20 × 6,672.87
  4. Step 4: Simplify right side
    6,921.90x = 64,067,559.44
  5. Step 5: Solve for x
    x = 64,067,559.44/6,921.90
  6. Step 6: Final answer
    x = 9,255.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.