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Finding the Fourth Proportional to 85,685.82, 128,305.17 and 68,954.46

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Solution

The fourth proportional to 85,685.82, 128,305.17 and 68,954.46 is: 103,251.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,685.82 : 128,305.17 = 68,954.46 : x
  2. Step 2: Convert to fraction form
    85,685.82/128,305.17 = 68,954.46/x
  3. Step 3: Cross multiply
    85,685.82x = 128,305.17 × 68,954.46
  4. Step 4: Simplify right side
    85,685.82x = 8,847,213,712.56
  5. Step 5: Solve for x
    x = 8,847,213,712.56/85,685.82
  6. Step 6: Final answer
    x = 103,251.78

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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.