Home / 20,808.79-31,231.73-9,721.73

Finding the Fourth Proportional to 20,808.79, 31,231.73 and 9,721.73

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Solution

The fourth proportional to 20,808.79, 31,231.73 and 9,721.73 is: 14,591.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,808.79 : 31,231.73 = 9,721.73 : x
  2. Step 2: Convert to fraction form
    20,808.79/31,231.73 = 9,721.73/x
  3. Step 3: Cross multiply
    20,808.79x = 31,231.73 × 9,721.73
  4. Step 4: Simplify right side
    20,808.79x = 303,626,548.88
  5. Step 5: Solve for x
    x = 303,626,548.88/20,808.79
  6. Step 6: Final answer
    x = 14,591.27

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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.