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Finding the Fourth Proportional to 7,974.70, 12,021.79 and 7,439.49

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Solution

The fourth proportional to 7,974.70, 12,021.79 and 7,439.49 is: 11,214.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,974.70 : 12,021.79 = 7,439.49 : x
  2. Step 2: Convert to fraction form
    7,974.70/12,021.79 = 7,439.49/x
  3. Step 3: Cross multiply
    7,974.70x = 12,021.79 × 7,439.49
  4. Step 4: Simplify right side
    7,974.70x = 89,435,986.49
  5. Step 5: Solve for x
    x = 89,435,986.49/7,974.70
  6. Step 6: Final answer
    x = 11,214.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.