Home / 12,739.82-19,121.85-7,819.07

Finding the Fourth Proportional to 12,739.82, 19,121.85 and 7,819.07

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Solution

The fourth proportional to 12,739.82, 19,121.85 and 7,819.07 is: 11,736.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,739.82 : 19,121.85 = 7,819.07 : x
  2. Step 2: Convert to fraction form
    12,739.82/19,121.85 = 7,819.07/x
  3. Step 3: Cross multiply
    12,739.82x = 19,121.85 × 7,819.07
  4. Step 4: Simplify right side
    12,739.82x = 149,514,988.07
  5. Step 5: Solve for x
    x = 149,514,988.07/12,739.82
  6. Step 6: Final answer
    x = 11,736.04

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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.