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Finding the Fourth Proportional to 12,789.20, 19,212.60 and 12,443.60

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Solution

The fourth proportional to 12,789.20, 19,212.60 and 12,443.60 is: 18,693.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,789.20 : 19,212.60 = 12,443.60 : x
  2. Step 2: Convert to fraction form
    12,789.20/19,212.60 = 12,443.60/x
  3. Step 3: Cross multiply
    12,789.20x = 19,212.60 × 12,443.60
  4. Step 4: Simplify right side
    12,789.20x = 239,073,909.36
  5. Step 5: Solve for x
    x = 239,073,909.36/12,789.20
  6. Step 6: Final answer
    x = 18,693.42

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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.