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Finding the Fourth Proportional to 518,996.43, 716,220.23 and 289,551.78

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Solution

The fourth proportional to 518,996.43, 716,220.23 and 289,551.78 is: 399,584.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,996.43 : 716,220.23 = 289,551.78 : x
  2. Step 2: Convert to fraction form
    518,996.43/716,220.23 = 289,551.78/x
  3. Step 3: Cross multiply
    518,996.43x = 716,220.23 × 289,551.78
  4. Step 4: Simplify right side
    518,996.43x = 207,382,841,020.75
  5. Step 5: Solve for x
    x = 207,382,841,020.75/518,996.43
  6. Step 6: Final answer
    x = 399,584.33

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.