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Finding the Fourth Proportional to 640,806.60, 961,296.30 and 220,211.40

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Solution

The fourth proportional to 640,806.60, 961,296.30 and 220,211.40 is: 330,346.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,806.60 : 961,296.30 = 220,211.40 : x
  2. Step 2: Convert to fraction form
    640,806.60/961,296.30 = 220,211.40/x
  3. Step 3: Cross multiply
    640,806.60x = 961,296.30 × 220,211.40
  4. Step 4: Simplify right side
    640,806.60x = 211,688,404,037.82
  5. Step 5: Solve for x
    x = 211,688,404,037.82/640,806.60
  6. Step 6: Final answer
    x = 330,346.79

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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.