Home / 15,112.82-20,855.81-8,399.07

Finding the Fourth Proportional to 15,112.82, 20,855.81 and 8,399.07

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Solution

The fourth proportional to 15,112.82, 20,855.81 and 8,399.07 is: 11,590.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,112.82 : 20,855.81 = 8,399.07 : x
  2. Step 2: Convert to fraction form
    15,112.82/20,855.81 = 8,399.07/x
  3. Step 3: Cross multiply
    15,112.82x = 20,855.81 × 8,399.07
  4. Step 4: Simplify right side
    15,112.82x = 175,169,408.10
  5. Step 5: Solve for x
    x = 175,169,408.10/15,112.82
  6. Step 6: Final answer
    x = 11,590.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.