Home / 20,680.55-28,539-11,249.12

Finding the Fourth Proportional to 20,680.55, 28,539 and 11,249.12

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Solution

The fourth proportional to 20,680.55, 28,539 and 11,249.12 is: 15,523.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,680.55 : 28,539 = 11,249.12 : x
  2. Step 2: Convert to fraction form
    20,680.55/28,539 = 11,249.12/x
  3. Step 3: Cross multiply
    20,680.55x = 28,539 × 11,249.12
  4. Step 4: Simplify right side
    20,680.55x = 321,038,635.68
  5. Step 5: Solve for x
    x = 321,038,635.68/20,680.55
  6. Step 6: Final answer
    x = 15,523.70

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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.