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Finding the Fourth Proportional to 19,212.38, 28,821.55 and 8,119.11

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Solution

The fourth proportional to 19,212.38, 28,821.55 and 8,119.11 is: 12,179.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,212.38 : 28,821.55 = 8,119.11 : x
  2. Step 2: Convert to fraction form
    19,212.38/28,821.55 = 8,119.11/x
  3. Step 3: Cross multiply
    19,212.38x = 28,821.55 × 8,119.11
  4. Step 4: Simplify right side
    19,212.38x = 234,005,334.82
  5. Step 5: Solve for x
    x = 234,005,334.82/19,212.38
  6. Step 6: Final answer
    x = 12,179.92

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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.