Home / 20,397.96-28,149.12-11,905.92

Finding the Fourth Proportional to 20,397.96, 28,149.12 and 11,905.92

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Solution

The fourth proportional to 20,397.96, 28,149.12 and 11,905.92 is: 16,430.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,397.96 : 28,149.12 = 11,905.92 : x
  2. Step 2: Convert to fraction form
    20,397.96/28,149.12 = 11,905.92/x
  3. Step 3: Cross multiply
    20,397.96x = 28,149.12 × 11,905.92
  4. Step 4: Simplify right side
    20,397.96x = 335,141,170.79
  5. Step 5: Solve for x
    x = 335,141,170.79/20,397.96
  6. Step 6: Final answer
    x = 16,430.13

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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.