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Finding the Fourth Proportional to 640,879.20, 960,006.60 and 325,513.80

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Solution

The fourth proportional to 640,879.20, 960,006.60 and 325,513.80 is: 487,604.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,879.20 : 960,006.60 = 325,513.80 : x
  2. Step 2: Convert to fraction form
    640,879.20/960,006.60 = 325,513.80/x
  3. Step 3: Cross multiply
    640,879.20x = 960,006.60 × 325,513.80
  4. Step 4: Simplify right side
    640,879.20x = 312,495,396,391.08
  5. Step 5: Solve for x
    x = 312,495,396,391.08/640,879.20
  6. Step 6: Final answer
    x = 487,604.21

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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.