Home / 20,972.75-28,942.49-12,020.78

Finding the Fourth Proportional to 20,972.75, 28,942.49 and 12,020.78

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Solution

The fourth proportional to 20,972.75, 28,942.49 and 12,020.78 is: 16,588.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,972.75 : 28,942.49 = 12,020.78 : x
  2. Step 2: Convert to fraction form
    20,972.75/28,942.49 = 12,020.78/x
  3. Step 3: Cross multiply
    20,972.75x = 28,942.49 × 12,020.78
  4. Step 4: Simplify right side
    20,972.75x = 347,911,304.94
  5. Step 5: Solve for x
    x = 347,911,304.94/20,972.75
  6. Step 6: Final answer
    x = 16,588.73

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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.