Home / 20,972.70-28,940.63-12,020.99

Finding the Fourth Proportional to 20,972.70, 28,940.63 and 12,020.99

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Solution

The fourth proportional to 20,972.70, 28,940.63 and 12,020.99 is: 16,587.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,972.70 : 28,940.63 = 12,020.99 : x
  2. Step 2: Convert to fraction form
    20,972.70/28,940.63 = 12,020.99/x
  3. Step 3: Cross multiply
    20,972.70x = 28,940.63 × 12,020.99
  4. Step 4: Simplify right side
    20,972.70x = 347,894,819.02
  5. Step 5: Solve for x
    x = 347,894,819.02/20,972.70
  6. Step 6: Final answer
    x = 16,587.98

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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.