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Finding the Fourth Proportional to 12,081.84, 18,120.12 and 3,315.84

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Solution

The fourth proportional to 12,081.84, 18,120.12 and 3,315.84 is: 4,973.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,081.84 : 18,120.12 = 3,315.84 : x
  2. Step 2: Convert to fraction form
    12,081.84/18,120.12 = 3,315.84/x
  3. Step 3: Cross multiply
    12,081.84x = 18,120.12 × 3,315.84
  4. Step 4: Simplify right side
    12,081.84x = 60,083,418.70
  5. Step 5: Solve for x
    x = 60,083,418.70/12,081.84
  6. Step 6: Final answer
    x = 4,973.04

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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.