Home / 1,213.13-1,819.69-380.20

Finding the Fourth Proportional to 1,213.13, 1,819.69 and 380.20

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Solution

The fourth proportional to 1,213.13, 1,819.69 and 380.20 is: 570.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.13 : 1,819.69 = 380.20 : x
  2. Step 2: Convert to fraction form
    1,213.13/1,819.69 = 380.20/x
  3. Step 3: Cross multiply
    1,213.13x = 1,819.69 × 380.20
  4. Step 4: Simplify right side
    1,213.13x = 691,842.78
  5. Step 5: Solve for x
    x = 691,842.78/1,213.13
  6. Step 6: Final answer
    x = 570.30

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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.