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Finding the Fourth Proportional to 12,638.46, 18,918.81 and 8,246.46

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Solution

The fourth proportional to 12,638.46, 18,918.81 and 8,246.46 is: 12,344.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,638.46 : 18,918.81 = 8,246.46 : x
  2. Step 2: Convert to fraction form
    12,638.46/18,918.81 = 8,246.46/x
  3. Step 3: Cross multiply
    12,638.46x = 18,918.81 × 8,246.46
  4. Step 4: Simplify right side
    12,638.46x = 156,013,209.91
  5. Step 5: Solve for x
    x = 156,013,209.91/12,638.46
  6. Step 6: Final answer
    x = 12,344.32

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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.