Home / 20,972.74-28,942.50-12,020.78

Finding the Fourth Proportional to 20,972.74, 28,942.50 and 12,020.78

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Solution

The fourth proportional to 20,972.74, 28,942.50 and 12,020.78 is: 16,588.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,972.74 : 28,942.50 = 12,020.78 : x
  2. Step 2: Convert to fraction form
    20,972.74/28,942.50 = 12,020.78/x
  3. Step 3: Cross multiply
    20,972.74x = 28,942.50 × 12,020.78
  4. Step 4: Simplify right side
    20,972.74x = 347,911,425.15
  5. Step 5: Solve for x
    x = 347,911,425.15/20,972.74
  6. Step 6: Final answer
    x = 16,588.74

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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.