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Finding the Fourth Proportional to 5,518.80, 8,278.20 and 1,819.80

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Solution

The fourth proportional to 5,518.80, 8,278.20 and 1,819.80 is: 2,729.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,518.80 : 8,278.20 = 1,819.80 : x
  2. Step 2: Convert to fraction form
    5,518.80/8,278.20 = 1,819.80/x
  3. Step 3: Cross multiply
    5,518.80x = 8,278.20 × 1,819.80
  4. Step 4: Simplify right side
    5,518.80x = 15,064,668.36
  5. Step 5: Solve for x
    x = 15,064,668.36/5,518.80
  6. Step 6: Final answer
    x = 2,729.70

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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.