Home / 13,213.20-19,819.80-3,979.20

Finding the Fourth Proportional to 13,213.20, 19,819.80 and 3,979.20

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Solution

The fourth proportional to 13,213.20, 19,819.80 and 3,979.20 is: 5,968.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,213.20 : 19,819.80 = 3,979.20 : x
  2. Step 2: Convert to fraction form
    13,213.20/19,819.80 = 3,979.20/x
  3. Step 3: Cross multiply
    13,213.20x = 19,819.80 × 3,979.20
  4. Step 4: Simplify right side
    13,213.20x = 78,866,948.16
  5. Step 5: Solve for x
    x = 78,866,948.16/13,213.20
  6. Step 6: Final answer
    x = 5,968.80

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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.