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Finding the Fourth Proportional to 18,486.97, 27,722.05 and 8,629.07

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Solution

The fourth proportional to 18,486.97, 27,722.05 and 8,629.07 is: 12,939.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,486.97 : 27,722.05 = 8,629.07 : x
  2. Step 2: Convert to fraction form
    18,486.97/27,722.05 = 8,629.07/x
  3. Step 3: Cross multiply
    18,486.97x = 27,722.05 × 8,629.07
  4. Step 4: Simplify right side
    18,486.97x = 239,215,349.81
  5. Step 5: Solve for x
    x = 239,215,349.81/18,486.97
  6. Step 6: Final answer
    x = 12,939.67

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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.