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Finding the Fourth Proportional to 12,638.75, 18,958.20 and 5,617.12

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Solution

The fourth proportional to 12,638.75, 18,958.20 and 5,617.12 is: 8,425.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,638.75 : 18,958.20 = 5,617.12 : x
  2. Step 2: Convert to fraction form
    12,638.75/18,958.20 = 5,617.12/x
  3. Step 3: Cross multiply
    12,638.75x = 18,958.20 × 5,617.12
  4. Step 4: Simplify right side
    12,638.75x = 106,490,389.59
  5. Step 5: Solve for x
    x = 106,490,389.59/12,638.75
  6. Step 6: Final answer
    x = 8,425.71

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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.