Home / 20,450.56-28,212.96-12,890.92

Finding the Fourth Proportional to 20,450.56, 28,212.96 and 12,890.92

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Solution

The fourth proportional to 20,450.56, 28,212.96 and 12,890.92 is: 17,783.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,450.56 : 28,212.96 = 12,890.92 : x
  2. Step 2: Convert to fraction form
    20,450.56/28,212.96 = 12,890.92/x
  3. Step 3: Cross multiply
    20,450.56x = 28,212.96 × 12,890.92
  4. Step 4: Simplify right side
    20,450.56x = 363,691,010.32
  5. Step 5: Solve for x
    x = 363,691,010.32/20,450.56
  6. Step 6: Final answer
    x = 17,783.91

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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.