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Finding the Fourth Proportional to 171,976.80, 257,965.20 and 129,986.40

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Solution

The fourth proportional to 171,976.80, 257,965.20 and 129,986.40 is: 194,979.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,976.80 : 257,965.20 = 129,986.40 : x
  2. Step 2: Convert to fraction form
    171,976.80/257,965.20 = 129,986.40/x
  3. Step 3: Cross multiply
    171,976.80x = 257,965.20 × 129,986.40
  4. Step 4: Simplify right side
    171,976.80x = 33,531,967,673.28
  5. Step 5: Solve for x
    x = 33,531,967,673.28/171,976.80
  6. Step 6: Final answer
    x = 194,979.60

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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.