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Finding the Fourth Proportional to 20,412.96, 28,169.96 and 11,920.92

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Solution

The fourth proportional to 20,412.96, 28,169.96 and 11,920.92 is: 16,450.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,412.96 : 28,169.96 = 11,920.92 : x
  2. Step 2: Convert to fraction form
    20,412.96/28,169.96 = 11,920.92/x
  3. Step 3: Cross multiply
    20,412.96x = 28,169.96 × 11,920.92
  4. Step 4: Simplify right side
    20,412.96x = 335,811,779.96
  5. Step 5: Solve for x
    x = 335,811,779.96/20,412.96
  6. Step 6: Final answer
    x = 16,450.91

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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.