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Finding the Fourth Proportional to 640,830.60, 960,986.70 and 219,889.80

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Solution

The fourth proportional to 640,830.60, 960,986.70 and 219,889.80 is: 329,745.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,830.60 : 960,986.70 = 219,889.80 : x
  2. Step 2: Convert to fraction form
    640,830.60/960,986.70 = 219,889.80/x
  3. Step 3: Cross multiply
    640,830.60x = 960,986.70 × 219,889.80
  4. Step 4: Simplify right side
    640,830.60x = 211,311,173,265.66
  5. Step 5: Solve for x
    x = 211,311,173,265.66/640,830.60
  6. Step 6: Final answer
    x = 329,745.76

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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.