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Finding the Fourth Proportional to 19,209.75, 28,819.49 and 5,358.75

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Solution

The fourth proportional to 19,209.75, 28,819.49 and 5,358.75 is: 8,039.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,209.75 : 28,819.49 = 5,358.75 : x
  2. Step 2: Convert to fraction form
    19,209.75/28,819.49 = 5,358.75/x
  3. Step 3: Cross multiply
    19,209.75x = 28,819.49 × 5,358.75
  4. Step 4: Simplify right side
    19,209.75x = 154,436,442.04
  5. Step 5: Solve for x
    x = 154,436,442.04/19,209.75
  6. Step 6: Final answer
    x = 8,039.48

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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.