Home / 20,979.89-28,952.99-11,420.57

Finding the Fourth Proportional to 20,979.89, 28,952.99 and 11,420.57

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Solution

The fourth proportional to 20,979.89, 28,952.99 and 11,420.57 is: 15,760.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.89 : 28,952.99 = 11,420.57 : x
  2. Step 2: Convert to fraction form
    20,979.89/28,952.99 = 11,420.57/x
  3. Step 3: Cross multiply
    20,979.89x = 28,952.99 × 11,420.57
  4. Step 4: Simplify right side
    20,979.89x = 330,659,559.03
  5. Step 5: Solve for x
    x = 330,659,559.03/20,979.89
  6. Step 6: Final answer
    x = 15,760.78

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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.