Home / 12,786.05-19,181.70-5,390.51

Finding the Fourth Proportional to 12,786.05, 19,181.70 and 5,390.51

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Solution

The fourth proportional to 12,786.05, 19,181.70 and 5,390.51 is: 8,086.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,786.05 : 19,181.70 = 5,390.51 : x
  2. Step 2: Convert to fraction form
    12,786.05/19,181.70 = 5,390.51/x
  3. Step 3: Cross multiply
    12,786.05x = 19,181.70 × 5,390.51
  4. Step 4: Simplify right side
    12,786.05x = 103,399,049.76
  5. Step 5: Solve for x
    x = 103,399,049.76/12,786.05
  6. Step 6: Final answer
    x = 8,086.86

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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.