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Finding the Fourth Proportional to 7,920.70, 11,882.84 and 3,240.09

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Solution

The fourth proportional to 7,920.70, 11,882.84 and 3,240.09 is: 4,860.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,920.70 : 11,882.84 = 3,240.09 : x
  2. Step 2: Convert to fraction form
    7,920.70/11,882.84 = 3,240.09/x
  3. Step 3: Cross multiply
    7,920.70x = 11,882.84 × 3,240.09
  4. Step 4: Simplify right side
    7,920.70x = 38,501,499.66
  5. Step 5: Solve for x
    x = 38,501,499.66/7,920.70
  6. Step 6: Final answer
    x = 4,860.87

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1.5x scale

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.