Home / 20,391.44-28,139.72-11,438.73

Finding the Fourth Proportional to 20,391.44, 28,139.72 and 11,438.73

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Solution

The fourth proportional to 20,391.44, 28,139.72 and 11,438.73 is: 15,785.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,391.44 : 28,139.72 = 11,438.73 : x
  2. Step 2: Convert to fraction form
    20,391.44/28,139.72 = 11,438.73/x
  3. Step 3: Cross multiply
    20,391.44x = 28,139.72 × 11,438.73
  4. Step 4: Simplify right side
    20,391.44x = 321,882,602.16
  5. Step 5: Solve for x
    x = 321,882,602.16/20,391.44
  6. Step 6: Final answer
    x = 15,785.19

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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.