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Finding the Fourth Proportional to 640,426.72, 960,659.52 and 219,696.48

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Solution

The fourth proportional to 640,426.72, 960,659.52 and 219,696.48 is: 329,551.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,426.72 : 960,659.52 = 219,696.48 : x
  2. Step 2: Convert to fraction form
    640,426.72/960,659.52 = 219,696.48/x
  3. Step 3: Cross multiply
    640,426.72x = 960,659.52 × 219,696.48
  4. Step 4: Simplify right side
    640,426.72x = 211,053,515,022.49
  5. Step 5: Solve for x
    x = 211,053,515,022.49/640,426.72
  6. Step 6: Final answer
    x = 329,551.39

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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.