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Finding the Fourth Proportional to 12,012.78, 18,019.17 and 4,219.80

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Solution

The fourth proportional to 12,012.78, 18,019.17 and 4,219.80 is: 6,329.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,012.78 : 18,019.17 = 4,219.80 : x
  2. Step 2: Convert to fraction form
    12,012.78/18,019.17 = 4,219.80/x
  3. Step 3: Cross multiply
    12,012.78x = 18,019.17 × 4,219.80
  4. Step 4: Simplify right side
    12,012.78x = 76,037,293.57
  5. Step 5: Solve for x
    x = 76,037,293.57/12,012.78
  6. Step 6: Final answer
    x = 6,329.70

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Similar ratio
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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.