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Finding the Fourth Proportional to 121,859.43, 168,000.66 and 85,511.49

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Solution

The fourth proportional to 121,859.43, 168,000.66 and 85,511.49 is: 117,889.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,859.43 : 168,000.66 = 85,511.49 : x
  2. Step 2: Convert to fraction form
    121,859.43/168,000.66 = 85,511.49/x
  3. Step 3: Cross multiply
    121,859.43x = 168,000.66 × 85,511.49
  4. Step 4: Simplify right side
    121,859.43x = 14,365,986,757.58
  5. Step 5: Solve for x
    x = 14,365,986,757.58/121,859.43
  6. Step 6: Final answer
    x = 117,889.82

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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.