Home / 20,949.56-28,910.96-11,390.09

Finding the Fourth Proportional to 20,949.56, 28,910.96 and 11,390.09

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Solution

The fourth proportional to 20,949.56, 28,910.96 and 11,390.09 is: 15,718.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,949.56 : 28,910.96 = 11,390.09 : x
  2. Step 2: Convert to fraction form
    20,949.56/28,910.96 = 11,390.09/x
  3. Step 3: Cross multiply
    20,949.56x = 28,910.96 × 11,390.09
  4. Step 4: Simplify right side
    20,949.56x = 329,298,407.37
  5. Step 5: Solve for x
    x = 329,298,407.37/20,949.56
  6. Step 6: Final answer
    x = 15,718.63

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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.