Home / 20,789.43-31,187.23-7,640.78

Finding the Fourth Proportional to 20,789.43, 31,187.23 and 7,640.78

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Solution

The fourth proportional to 20,789.43, 31,187.23 and 7,640.78 is: 11,462.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,789.43 : 31,187.23 = 7,640.78 : x
  2. Step 2: Convert to fraction form
    20,789.43/31,187.23 = 7,640.78/x
  3. Step 3: Cross multiply
    20,789.43x = 31,187.23 × 7,640.78
  4. Step 4: Simplify right side
    20,789.43x = 238,294,588.20
  5. Step 5: Solve for x
    x = 238,294,588.20/20,789.43
  6. Step 6: Final answer
    x = 11,462.30

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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.