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Finding the Fourth Proportional to 13,189.80, 19,746.30 and 12,805.80

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Solution

The fourth proportional to 13,189.80, 19,746.30 and 12,805.80 is: 19,171.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,189.80 : 19,746.30 = 12,805.80 : x
  2. Step 2: Convert to fraction form
    13,189.80/19,746.30 = 12,805.80/x
  3. Step 3: Cross multiply
    13,189.80x = 19,746.30 × 12,805.80
  4. Step 4: Simplify right side
    13,189.80x = 252,867,168.54
  5. Step 5: Solve for x
    x = 252,867,168.54/13,189.80
  6. Step 6: Final answer
    x = 19,171.42

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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.