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Finding the Fourth Proportional to 2,179.86, 3,269.43 and 640.50

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Solution

The fourth proportional to 2,179.86, 3,269.43 and 640.50 is: 960.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,179.86 : 3,269.43 = 640.50 : x
  2. Step 2: Convert to fraction form
    2,179.86/3,269.43 = 640.50/x
  3. Step 3: Cross multiply
    2,179.86x = 3,269.43 × 640.50
  4. Step 4: Simplify right side
    2,179.86x = 2,094,069.92
  5. Step 5: Solve for x
    x = 2,094,069.92/2,179.86
  6. Step 6: Final answer
    x = 960.64

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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.