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Finding the Fourth Proportional to 123,879.54, 170,641.17 and 99,939.18

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Solution

The fourth proportional to 123,879.54, 170,641.17 and 99,939.18 is: 137,663.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,879.54 : 170,641.17 = 99,939.18 : x
  2. Step 2: Convert to fraction form
    123,879.54/170,641.17 = 99,939.18/x
  3. Step 3: Cross multiply
    123,879.54x = 170,641.17 × 99,939.18
  4. Step 4: Simplify right side
    123,879.54x = 17,053,738,604.04
  5. Step 5: Solve for x
    x = 17,053,738,604.04/123,879.54
  6. Step 6: Final answer
    x = 137,663.88

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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.