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Finding the Fourth Proportional to 12,619.20, 18,928.80 and 11,209.80

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Solution

The fourth proportional to 12,619.20, 18,928.80 and 11,209.80 is: 16,814.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,619.20 : 18,928.80 = 11,209.80 : x
  2. Step 2: Convert to fraction form
    12,619.20/18,928.80 = 11,209.80/x
  3. Step 3: Cross multiply
    12,619.20x = 18,928.80 × 11,209.80
  4. Step 4: Simplify right side
    12,619.20x = 212,188,062.24
  5. Step 5: Solve for x
    x = 212,188,062.24/12,619.20
  6. Step 6: Final answer
    x = 16,814.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.