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Finding the Fourth Proportional to 640,847.10, 961,011.45 and 219,906.30

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Solution

The fourth proportional to 640,847.10, 961,011.45 and 219,906.30 is: 329,770.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,847.10 : 961,011.45 = 219,906.30 : x
  2. Step 2: Convert to fraction form
    640,847.10/961,011.45 = 219,906.30/x
  3. Step 3: Cross multiply
    640,847.10x = 961,011.45 × 219,906.30
  4. Step 4: Simplify right side
    640,847.10x = 211,332,472,227.14
  5. Step 5: Solve for x
    x = 211,332,472,227.14/640,847.10
  6. Step 6: Final answer
    x = 329,770.51

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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.