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Finding the Fourth Proportional to 137,666.80, 206,500.20 and 85,178.80

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Solution

The fourth proportional to 137,666.80, 206,500.20 and 85,178.80 is: 127,768.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,666.80 : 206,500.20 = 85,178.80 : x
  2. Step 2: Convert to fraction form
    137,666.80/206,500.20 = 85,178.80/x
  3. Step 3: Cross multiply
    137,666.80x = 206,500.20 × 85,178.80
  4. Step 4: Simplify right side
    137,666.80x = 17,589,439,235.76
  5. Step 5: Solve for x
    x = 17,589,439,235.76/137,666.80
  6. Step 6: Final answer
    x = 127,768.20

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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.