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Finding the Fourth Proportional to 640,216.20, 960,324.30 and 321,351.60

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Solution

The fourth proportional to 640,216.20, 960,324.30 and 321,351.60 is: 482,027.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,216.20 : 960,324.30 = 321,351.60 : x
  2. Step 2: Convert to fraction form
    640,216.20/960,324.30 = 321,351.60/x
  3. Step 3: Cross multiply
    640,216.20x = 960,324.30 × 321,351.60
  4. Step 4: Simplify right side
    640,216.20x = 308,601,750,323.88
  5. Step 5: Solve for x
    x = 308,601,750,323.88/640,216.20
  6. Step 6: Final answer
    x = 482,027.40

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Similar ratio
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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.