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Finding the Fourth Proportional to 121,863.88, 168,195.40 and 81,647.76

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Solution

The fourth proportional to 121,863.88, 168,195.40 and 81,647.76 is: 112,689.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,863.88 : 168,195.40 = 81,647.76 : x
  2. Step 2: Convert to fraction form
    121,863.88/168,195.40 = 81,647.76/x
  3. Step 3: Cross multiply
    121,863.88x = 168,195.40 × 81,647.76
  4. Step 4: Simplify right side
    121,863.88x = 13,732,777,652.30
  5. Step 5: Solve for x
    x = 13,732,777,652.30/121,863.88
  6. Step 6: Final answer
    x = 112,689.48

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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.