Home / 20,380.56-28,123.22-11,428.44

Finding the Fourth Proportional to 20,380.56, 28,123.22 and 11,428.44

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Solution

The fourth proportional to 20,380.56, 28,123.22 and 11,428.44 is: 15,770.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,380.56 : 28,123.22 = 11,428.44 : x
  2. Step 2: Convert to fraction form
    20,380.56/28,123.22 = 11,428.44/x
  3. Step 3: Cross multiply
    20,380.56x = 28,123.22 × 11,428.44
  4. Step 4: Simplify right side
    20,380.56x = 321,404,532.38
  5. Step 5: Solve for x
    x = 321,404,532.38/20,380.56
  6. Step 6: Final answer
    x = 15,770.15

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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.