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Finding the Fourth Proportional to 18,821.19, 28,233.86 and 8,286.69

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Solution

The fourth proportional to 18,821.19, 28,233.86 and 8,286.69 is: 12,430.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,821.19 : 28,233.86 = 8,286.69 : x
  2. Step 2: Convert to fraction form
    18,821.19/28,233.86 = 8,286.69/x
  3. Step 3: Cross multiply
    18,821.19x = 28,233.86 × 8,286.69
  4. Step 4: Simplify right side
    18,821.19x = 233,965,203.89
  5. Step 5: Solve for x
    x = 233,965,203.89/18,821.19
  6. Step 6: Final answer
    x = 12,430.95

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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.