Home / 20,945.75-31,399.95-7,789.13

Finding the Fourth Proportional to 20,945.75, 31,399.95 and 7,789.13

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Solution

The fourth proportional to 20,945.75, 31,399.95 and 7,789.13 is: 11,676.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,945.75 : 31,399.95 = 7,789.13 : x
  2. Step 2: Convert to fraction form
    20,945.75/31,399.95 = 7,789.13/x
  3. Step 3: Cross multiply
    20,945.75x = 31,399.95 × 7,789.13
  4. Step 4: Simplify right side
    20,945.75x = 244,578,135.54
  5. Step 5: Solve for x
    x = 244,578,135.54/20,945.75
  6. Step 6: Final answer
    x = 11,676.74

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1.5x scale

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.