Home / 20,956.11-28,917.97-12,457.79

Finding the Fourth Proportional to 20,956.11, 28,917.97 and 12,457.79

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Solution

The fourth proportional to 20,956.11, 28,917.97 and 12,457.79 is: 17,190.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,956.11 : 28,917.97 = 12,457.79 : x
  2. Step 2: Convert to fraction form
    20,956.11/28,917.97 = 12,457.79/x
  3. Step 3: Cross multiply
    20,956.11x = 28,917.97 × 12,457.79
  4. Step 4: Simplify right side
    20,956.11x = 360,253,997.49
  5. Step 5: Solve for x
    x = 360,253,997.49/20,956.11
  6. Step 6: Final answer
    x = 17,190.88

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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.