Home / 20,823.75-31,238.88-6,780.47

Finding the Fourth Proportional to 20,823.75, 31,238.88 and 6,780.47

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Solution

The fourth proportional to 20,823.75, 31,238.88 and 6,780.47 is: 10,171.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,823.75 : 31,238.88 = 6,780.47 : x
  2. Step 2: Convert to fraction form
    20,823.75/31,238.88 = 6,780.47/x
  3. Step 3: Cross multiply
    20,823.75x = 31,238.88 × 6,780.47
  4. Step 4: Simplify right side
    20,823.75x = 211,814,107.05
  5. Step 5: Solve for x
    x = 211,814,107.05/20,823.75
  6. Step 6: Final answer
    x = 10,171.76

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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.