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Finding the Fourth Proportional to 18,019.20, 27,028.80 and 12,478.80

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Solution

The fourth proportional to 18,019.20, 27,028.80 and 12,478.80 is: 18,718.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,019.20 : 27,028.80 = 12,478.80 : x
  2. Step 2: Convert to fraction form
    18,019.20/27,028.80 = 12,478.80/x
  3. Step 3: Cross multiply
    18,019.20x = 27,028.80 × 12,478.80
  4. Step 4: Simplify right side
    18,019.20x = 337,286,989.44
  5. Step 5: Solve for x
    x = 337,286,989.44/18,019.20
  6. Step 6: Final answer
    x = 18,718.20

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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.