Home / 20,780.43-31,170.65-5,198.06

Finding the Fourth Proportional to 20,780.43, 31,170.65 and 5,198.06

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Solution

The fourth proportional to 20,780.43, 31,170.65 and 5,198.06 is: 7,797.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,780.43 : 31,170.65 = 5,198.06 : x
  2. Step 2: Convert to fraction form
    20,780.43/31,170.65 = 5,198.06/x
  3. Step 3: Cross multiply
    20,780.43x = 31,170.65 × 5,198.06
  4. Step 4: Simplify right side
    20,780.43x = 162,026,727.10
  5. Step 5: Solve for x
    x = 162,026,727.10/20,780.43
  6. Step 6: Final answer
    x = 7,797.08

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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.