Home / 7,043.82-9,720.78-3,900

Finding the Fourth Proportional to 7,043.82, 9,720.78 and 3,900

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Solution

The fourth proportional to 7,043.82, 9,720.78 and 3,900 is: 5,382.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,043.82 : 9,720.78 = 3,900 : x
  2. Step 2: Convert to fraction form
    7,043.82/9,720.78 = 3,900/x
  3. Step 3: Cross multiply
    7,043.82x = 9,720.78 × 3,900
  4. Step 4: Simplify right side
    7,043.82x = 37,911,042
  5. Step 5: Solve for x
    x = 37,911,042/7,043.82
  6. Step 6: Final answer
    x = 5,382.17

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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.