Home / 13,431.72-20,108.70-11,215.56

Finding the Fourth Proportional to 13,431.72, 20,108.70 and 11,215.56

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Solution

The fourth proportional to 13,431.72, 20,108.70 and 11,215.56 is: 16,790.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,431.72 : 20,108.70 = 11,215.56 : x
  2. Step 2: Convert to fraction form
    13,431.72/20,108.70 = 11,215.56/x
  3. Step 3: Cross multiply
    13,431.72x = 20,108.70 × 11,215.56
  4. Step 4: Simplify right side
    13,431.72x = 225,530,331.37
  5. Step 5: Solve for x
    x = 225,530,331.37/13,431.72
  6. Step 6: Final answer
    x = 16,790.87

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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.