Home / 20,351.94-28,086.21-11,399.40

Finding the Fourth Proportional to 20,351.94, 28,086.21 and 11,399.40

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Solution

The fourth proportional to 20,351.94, 28,086.21 and 11,399.40 is: 15,731.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,351.94 : 28,086.21 = 11,399.40 : x
  2. Step 2: Convert to fraction form
    20,351.94/28,086.21 = 11,399.40/x
  3. Step 3: Cross multiply
    20,351.94x = 28,086.21 × 11,399.40
  4. Step 4: Simplify right side
    20,351.94x = 320,165,942.27
  5. Step 5: Solve for x
    x = 320,165,942.27/20,351.94
  6. Step 6: Final answer
    x = 15,731.47

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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.