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Finding the Fourth Proportional to 12,918.80, 19,378.20 and 11,229.20

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Solution

The fourth proportional to 12,918.80, 19,378.20 and 11,229.20 is: 16,843.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,918.80 : 19,378.20 = 11,229.20 : x
  2. Step 2: Convert to fraction form
    12,918.80/19,378.20 = 11,229.20/x
  3. Step 3: Cross multiply
    12,918.80x = 19,378.20 × 11,229.20
  4. Step 4: Simplify right side
    12,918.80x = 217,601,683.44
  5. Step 5: Solve for x
    x = 217,601,683.44/12,918.80
  6. Step 6: Final answer
    x = 16,843.80

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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.