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Finding the Fourth Proportional to 8,638.42, 12,939.41 and 8,540.01

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Solution

The fourth proportional to 8,638.42, 12,939.41 and 8,540.01 is: 12,791.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,638.42 : 12,939.41 = 8,540.01 : x
  2. Step 2: Convert to fraction form
    8,638.42/12,939.41 = 8,540.01/x
  3. Step 3: Cross multiply
    8,638.42x = 12,939.41 × 8,540.01
  4. Step 4: Simplify right side
    8,638.42x = 110,502,583.40
  5. Step 5: Solve for x
    x = 110,502,583.40/8,638.42
  6. Step 6: Final answer
    x = 12,791.99

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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.