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Finding the Fourth Proportional to 2,179.75, 3,270.30 and 640.75

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Solution

The fourth proportional to 2,179.75, 3,270.30 and 640.75 is: 961.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,179.75 : 3,270.30 = 640.75 : x
  2. Step 2: Convert to fraction form
    2,179.75/3,270.30 = 640.75/x
  3. Step 3: Cross multiply
    2,179.75x = 3,270.30 × 640.75
  4. Step 4: Simplify right side
    2,179.75x = 2,095,444.73
  5. Step 5: Solve for x
    x = 2,095,444.73/2,179.75
  6. Step 6: Final answer
    x = 961.32

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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.