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Finding the Fourth Proportional to 3,221.78, 4,838.17 and 1,979.65

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Solution

The fourth proportional to 3,221.78, 4,838.17 and 1,979.65 is: 2,972.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,221.78 : 4,838.17 = 1,979.65 : x
  2. Step 2: Convert to fraction form
    3,221.78/4,838.17 = 1,979.65/x
  3. Step 3: Cross multiply
    3,221.78x = 4,838.17 × 1,979.65
  4. Step 4: Simplify right side
    3,221.78x = 9,577,883.24
  5. Step 5: Solve for x
    x = 9,577,883.24/3,221.78
  6. Step 6: Final answer
    x = 2,972.85

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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.