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Finding the Fourth Proportional to 7,126.92, 9,834.30 and 3,939.79

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Solution

The fourth proportional to 7,126.92, 9,834.30 and 3,939.79 is: 5,436.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,126.92 : 9,834.30 = 3,939.79 : x
  2. Step 2: Convert to fraction form
    7,126.92/9,834.30 = 3,939.79/x
  3. Step 3: Cross multiply
    7,126.92x = 9,834.30 × 3,939.79
  4. Step 4: Simplify right side
    7,126.92x = 38,745,076.80
  5. Step 5: Solve for x
    x = 38,745,076.80/7,126.92
  6. Step 6: Final answer
    x = 5,436.44

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1.5x scale

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.