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Finding the Fourth Proportional to 13,992.80, 20,986.39 and 6,874.07

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Solution

The fourth proportional to 13,992.80, 20,986.39 and 6,874.07 is: 10,309.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,992.80 : 20,986.39 = 6,874.07 : x
  2. Step 2: Convert to fraction form
    13,992.80/20,986.39 = 6,874.07/x
  3. Step 3: Cross multiply
    13,992.80x = 20,986.39 × 6,874.07
  4. Step 4: Simplify right side
    13,992.80x = 144,261,817.57
  5. Step 5: Solve for x
    x = 144,261,817.57/13,992.80
  6. Step 6: Final answer
    x = 10,309.72

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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.