Home / 20,739.11-31,108.78-5,156.73

Finding the Fourth Proportional to 20,739.11, 31,108.78 and 5,156.73

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Solution

The fourth proportional to 20,739.11, 31,108.78 and 5,156.73 is: 7,735.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,739.11 : 31,108.78 = 5,156.73 : x
  2. Step 2: Convert to fraction form
    20,739.11/31,108.78 = 5,156.73/x
  3. Step 3: Cross multiply
    20,739.11x = 31,108.78 × 5,156.73
  4. Step 4: Simplify right side
    20,739.11x = 160,419,579.09
  5. Step 5: Solve for x
    x = 160,419,579.09/20,739.11
  6. Step 6: Final answer
    x = 7,735.12

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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.