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Finding the Fourth Proportional to 18,949.20, 28,456.20 and 12,404.40

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Solution

The fourth proportional to 18,949.20, 28,456.20 and 12,404.40 is: 18,627.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,949.20 : 28,456.20 = 12,404.40 : x
  2. Step 2: Convert to fraction form
    18,949.20/28,456.20 = 12,404.40/x
  3. Step 3: Cross multiply
    18,949.20x = 28,456.20 × 12,404.40
  4. Step 4: Simplify right side
    18,949.20x = 352,982,087.28
  5. Step 5: Solve for x
    x = 352,982,087.28/18,949.20
  6. Step 6: Final answer
    x = 18,627.81

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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.