Home / 20,939.36-31,408.97-9,091.59

Finding the Fourth Proportional to 20,939.36, 31,408.97 and 9,091.59

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Solution

The fourth proportional to 20,939.36, 31,408.97 and 9,091.59 is: 13,637.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.36 : 31,408.97 = 9,091.59 : x
  2. Step 2: Convert to fraction form
    20,939.36/31,408.97 = 9,091.59/x
  3. Step 3: Cross multiply
    20,939.36x = 31,408.97 × 9,091.59
  4. Step 4: Simplify right side
    20,939.36x = 285,557,656.04
  5. Step 5: Solve for x
    x = 285,557,656.04/20,939.36
  6. Step 6: Final answer
    x = 13,637.37

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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.