Home / 20,988.30-31,481.43-7,839.65

Finding the Fourth Proportional to 20,988.30, 31,481.43 and 7,839.65

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Solution

The fourth proportional to 20,988.30, 31,481.43 and 7,839.65 is: 11,759.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.30 : 31,481.43 = 7,839.65 : x
  2. Step 2: Convert to fraction form
    20,988.30/31,481.43 = 7,839.65/x
  3. Step 3: Cross multiply
    20,988.30x = 31,481.43 × 7,839.65
  4. Step 4: Simplify right side
    20,988.30x = 246,803,392.70
  5. Step 5: Solve for x
    x = 246,803,392.70/20,988.30
  6. Step 6: Final answer
    x = 11,759.09

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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.