Home / 20,910-28,861.33-12,947.70

Finding the Fourth Proportional to 20,910, 28,861.33 and 12,947.70

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Solution

The fourth proportional to 20,910, 28,861.33 and 12,947.70 is: 17,871.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,910 : 28,861.33 = 12,947.70 : x
  2. Step 2: Convert to fraction form
    20,910/28,861.33 = 12,947.70/x
  3. Step 3: Cross multiply
    20,910x = 28,861.33 × 12,947.70
  4. Step 4: Simplify right side
    20,910x = 373,687,842.44
  5. Step 5: Solve for x
    x = 373,687,842.44/20,910
  6. Step 6: Final answer
    x = 17,871.25

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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.