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Finding the Fourth Proportional to 12,489.40, 18,734.10 and 3,255.40

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Solution

The fourth proportional to 12,489.40, 18,734.10 and 3,255.40 is: 4,883.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.40 : 18,734.10 = 3,255.40 : x
  2. Step 2: Convert to fraction form
    12,489.40/18,734.10 = 3,255.40/x
  3. Step 3: Cross multiply
    12,489.40x = 18,734.10 × 3,255.40
  4. Step 4: Simplify right side
    12,489.40x = 60,986,989.14
  5. Step 5: Solve for x
    x = 60,986,989.14/12,489.40
  6. Step 6: Final answer
    x = 4,883.10

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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.