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Finding the Fourth Proportional to 20,619, 28,453.95 and 11,187.90

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Solution

The fourth proportional to 20,619, 28,453.95 and 11,187.90 is: 15,439.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,619 : 28,453.95 = 11,187.90 : x
  2. Step 2: Convert to fraction form
    20,619/28,453.95 = 11,187.90/x
  3. Step 3: Cross multiply
    20,619x = 28,453.95 × 11,187.90
  4. Step 4: Simplify right side
    20,619x = 318,339,947.21
  5. Step 5: Solve for x
    x = 318,339,947.21/20,619
  6. Step 6: Final answer
    x = 15,439.16

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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.