Home / 12,139.38-18,210.36-3,819.66

Finding the Fourth Proportional to 12,139.38, 18,210.36 and 3,819.66

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Solution

The fourth proportional to 12,139.38, 18,210.36 and 3,819.66 is: 5,729.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,139.38 : 18,210.36 = 3,819.66 : x
  2. Step 2: Convert to fraction form
    12,139.38/18,210.36 = 3,819.66/x
  3. Step 3: Cross multiply
    12,139.38x = 18,210.36 × 3,819.66
  4. Step 4: Simplify right side
    12,139.38x = 69,557,383.68
  5. Step 5: Solve for x
    x = 69,557,383.68/12,139.38
  6. Step 6: Final answer
    x = 5,729.90

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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.