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Finding the Fourth Proportional to 640,936.80, 961,405.20 and 266,911.20

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Solution

The fourth proportional to 640,936.80, 961,405.20 and 266,911.20 is: 400,366.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,936.80 : 961,405.20 = 266,911.20 : x
  2. Step 2: Convert to fraction form
    640,936.80/961,405.20 = 266,911.20/x
  3. Step 3: Cross multiply
    640,936.80x = 961,405.20 × 266,911.20
  4. Step 4: Simplify right side
    640,936.80x = 256,609,815,618.24
  5. Step 5: Solve for x
    x = 256,609,815,618.24/640,936.80
  6. Step 6: Final answer
    x = 400,366.80

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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.