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Finding the Fourth Proportional to 640,006.72, 960,612.72 and 324,689.92

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Solution

The fourth proportional to 640,006.72, 960,612.72 and 324,689.92 is: 487,340.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,006.72 : 960,612.72 = 324,689.92 : x
  2. Step 2: Convert to fraction form
    640,006.72/960,612.72 = 324,689.92/x
  3. Step 3: Cross multiply
    640,006.72x = 960,612.72 × 324,689.92
  4. Step 4: Simplify right side
    640,006.72x = 311,901,267,207.78
  5. Step 5: Solve for x
    x = 311,901,267,207.78/640,006.72
  6. Step 6: Final answer
    x = 487,340.61

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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.