Home / 7,129.82-9,839.68-3,985.80

Finding the Fourth Proportional to 7,129.82, 9,839.68 and 3,985.80

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Solution

The fourth proportional to 7,129.82, 9,839.68 and 3,985.80 is: 5,500.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,129.82 : 9,839.68 = 3,985.80 : x
  2. Step 2: Convert to fraction form
    7,129.82/9,839.68 = 3,985.80/x
  3. Step 3: Cross multiply
    7,129.82x = 9,839.68 × 3,985.80
  4. Step 4: Simplify right side
    7,129.82x = 39,218,996.54
  5. Step 5: Solve for x
    x = 39,218,996.54/7,129.82
  6. Step 6: Final answer
    x = 5,500.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.