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Finding the Fourth Proportional to 6,479.80, 9,721.11 and 2,097.70

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Solution

The fourth proportional to 6,479.80, 9,721.11 and 2,097.70 is: 3,147.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,479.80 : 9,721.11 = 2,097.70 : x
  2. Step 2: Convert to fraction form
    6,479.80/9,721.11 = 2,097.70/x
  3. Step 3: Cross multiply
    6,479.80x = 9,721.11 × 2,097.70
  4. Step 4: Simplify right side
    6,479.80x = 20,391,972.45
  5. Step 5: Solve for x
    x = 20,391,972.45/6,479.80
  6. Step 6: Final answer
    x = 3,147.01

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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.