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Finding the Fourth Proportional to 640,879.20, 961,383.96 and 220,100.40

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Solution

The fourth proportional to 640,879.20, 961,383.96 and 220,100.40 is: 330,172.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,879.20 : 961,383.96 = 220,100.40 : x
  2. Step 2: Convert to fraction form
    640,879.20/961,383.96 = 220,100.40/x
  3. Step 3: Cross multiply
    640,879.20x = 961,383.96 × 220,100.40
  4. Step 4: Simplify right side
    640,879.20x = 211,600,994,149.58
  5. Step 5: Solve for x
    x = 211,600,994,149.58/640,879.20
  6. Step 6: Final answer
    x = 330,172.98

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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.