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Finding the Fourth Proportional to 18,818.87, 28,227.42 and 7,722.81

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Solution

The fourth proportional to 18,818.87, 28,227.42 and 7,722.81 is: 11,583.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,818.87 : 28,227.42 = 7,722.81 : x
  2. Step 2: Convert to fraction form
    18,818.87/28,227.42 = 7,722.81/x
  3. Step 3: Cross multiply
    18,818.87x = 28,227.42 × 7,722.81
  4. Step 4: Simplify right side
    18,818.87x = 217,995,001.45
  5. Step 5: Solve for x
    x = 217,995,001.45/18,818.87
  6. Step 6: Final answer
    x = 11,583.85

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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.