Home / 20,912.09-28,845.54-12,408.20

Finding the Fourth Proportional to 20,912.09, 28,845.54 and 12,408.20

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Solution

The fourth proportional to 20,912.09, 28,845.54 and 12,408.20 is: 17,115.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,912.09 : 28,845.54 = 12,408.20 : x
  2. Step 2: Convert to fraction form
    20,912.09/28,845.54 = 12,408.20/x
  3. Step 3: Cross multiply
    20,912.09x = 28,845.54 × 12,408.20
  4. Step 4: Simplify right side
    20,912.09x = 357,921,085.20
  5. Step 5: Solve for x
    x = 357,921,085.20/20,912.09
  6. Step 6: Final answer
    x = 17,115.51

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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.