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Finding the Fourth Proportional to 138,161.88, 206,892.90 and 85,411.44

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Solution

The fourth proportional to 138,161.88, 206,892.90 and 85,411.44 is: 127,900.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,161.88 : 206,892.90 = 85,411.44 : x
  2. Step 2: Convert to fraction form
    138,161.88/206,892.90 = 85,411.44/x
  3. Step 3: Cross multiply
    138,161.88x = 206,892.90 × 85,411.44
  4. Step 4: Simplify right side
    138,161.88x = 17,671,020,514.78
  5. Step 5: Solve for x
    x = 17,671,020,514.78/138,161.88
  6. Step 6: Final answer
    x = 127,900.84

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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.