Home / 20,838.09-31,238.37-7,687.20

Finding the Fourth Proportional to 20,838.09, 31,238.37 and 7,687.20

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Solution

The fourth proportional to 20,838.09, 31,238.37 and 7,687.20 is: 11,523.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,838.09 : 31,238.37 = 7,687.20 : x
  2. Step 2: Convert to fraction form
    20,838.09/31,238.37 = 7,687.20/x
  3. Step 3: Cross multiply
    20,838.09x = 31,238.37 × 7,687.20
  4. Step 4: Simplify right side
    20,838.09x = 240,135,597.86
  5. Step 5: Solve for x
    x = 240,135,597.86/20,838.09
  6. Step 6: Final answer
    x = 11,523.88

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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.