Home / 20,908.78-28,855.21-11,958.07

Finding the Fourth Proportional to 20,908.78, 28,855.21 and 11,958.07

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Solution

The fourth proportional to 20,908.78, 28,855.21 and 11,958.07 is: 16,502.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,908.78 : 28,855.21 = 11,958.07 : x
  2. Step 2: Convert to fraction form
    20,908.78/28,855.21 = 11,958.07/x
  3. Step 3: Cross multiply
    20,908.78x = 28,855.21 × 11,958.07
  4. Step 4: Simplify right side
    20,908.78x = 345,052,621.04
  5. Step 5: Solve for x
    x = 345,052,621.04/20,908.78
  6. Step 6: Final answer
    x = 16,502.76

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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.