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Finding the Fourth Proportional to 18,991.20, 28,508.40 and 11,204.40

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Solution

The fourth proportional to 18,991.20, 28,508.40 and 11,204.40 is: 16,819.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.20 : 28,508.40 = 11,204.40 : x
  2. Step 2: Convert to fraction form
    18,991.20/28,508.40 = 11,204.40/x
  3. Step 3: Cross multiply
    18,991.20x = 28,508.40 × 11,204.40
  4. Step 4: Simplify right side
    18,991.20x = 319,419,516.96
  5. Step 5: Solve for x
    x = 319,419,516.96/18,991.20
  6. Step 6: Final answer
    x = 16,819.34

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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.