Home / 20,391.94-28,138.35-11,438.20

Finding the Fourth Proportional to 20,391.94, 28,138.35 and 11,438.20

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Solution

The fourth proportional to 20,391.94, 28,138.35 and 11,438.20 is: 15,783.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,391.94 : 28,138.35 = 11,438.20 : x
  2. Step 2: Convert to fraction form
    20,391.94/28,138.35 = 11,438.20/x
  3. Step 3: Cross multiply
    20,391.94x = 28,138.35 × 11,438.20
  4. Step 4: Simplify right side
    20,391.94x = 321,852,074.97
  5. Step 5: Solve for x
    x = 321,852,074.97/20,391.94
  6. Step 6: Final answer
    x = 15,783.30

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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.