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Finding the Fourth Proportional to 515,939.68, 712,009.20 and 289,606.24

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Solution

The fourth proportional to 515,939.68, 712,009.20 and 289,606.24 is: 399,663.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,939.68 : 712,009.20 = 289,606.24 : x
  2. Step 2: Convert to fraction form
    515,939.68/712,009.20 = 289,606.24/x
  3. Step 3: Cross multiply
    515,939.68x = 712,009.20 × 289,606.24
  4. Step 4: Simplify right side
    515,939.68x = 206,202,307,257.41
  5. Step 5: Solve for x
    x = 206,202,307,257.41/515,939.68
  6. Step 6: Final answer
    x = 399,663.59

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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.