Home / 20,809.56-31,187.34-15,861

Finding the Fourth Proportional to 20,809.56, 31,187.34 and 15,861

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Solution

The fourth proportional to 20,809.56, 31,187.34 and 15,861 is: 23,770.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,809.56 : 31,187.34 = 15,861 : x
  2. Step 2: Convert to fraction form
    20,809.56/31,187.34 = 15,861/x
  3. Step 3: Cross multiply
    20,809.56x = 31,187.34 × 15,861
  4. Step 4: Simplify right side
    20,809.56x = 494,662,399.74
  5. Step 5: Solve for x
    x = 494,662,399.74/20,809.56
  6. Step 6: Final answer
    x = 23,770.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.