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Finding the Fourth Proportional to 12,486.63, 18,739.17 and 5,912.81

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Solution

The fourth proportional to 12,486.63, 18,739.17 and 5,912.81 is: 8,873.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,486.63 : 18,739.17 = 5,912.81 : x
  2. Step 2: Convert to fraction form
    12,486.63/18,739.17 = 5,912.81/x
  3. Step 3: Cross multiply
    12,486.63x = 18,739.17 × 5,912.81
  4. Step 4: Simplify right side
    12,486.63x = 110,801,128.34
  5. Step 5: Solve for x
    x = 110,801,128.34/12,486.63
  6. Step 6: Final answer
    x = 8,873.58

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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.