Home / 20,979.20-28,950.37-11,419.10

Finding the Fourth Proportional to 20,979.20, 28,950.37 and 11,419.10

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Solution

The fourth proportional to 20,979.20, 28,950.37 and 11,419.10 is: 15,757.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.20 : 28,950.37 = 11,419.10 : x
  2. Step 2: Convert to fraction form
    20,979.20/28,950.37 = 11,419.10/x
  3. Step 3: Cross multiply
    20,979.20x = 28,950.37 × 11,419.10
  4. Step 4: Simplify right side
    20,979.20x = 330,587,267.04
  5. Step 5: Solve for x
    x = 330,587,267.04/20,979.20
  6. Step 6: Final answer
    x = 15,757.86

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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.