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Finding the Fourth Proportional to 85,685.45, 128,304.61 and 68,954.09

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Solution

The fourth proportional to 85,685.45, 128,304.61 and 68,954.09 is: 103,251.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,685.45 : 128,304.61 = 68,954.09 : x
  2. Step 2: Convert to fraction form
    85,685.45/128,304.61 = 68,954.09/x
  3. Step 3: Cross multiply
    85,685.45x = 128,304.61 × 68,954.09
  4. Step 4: Simplify right side
    85,685.45x = 8,847,126,811.45
  5. Step 5: Solve for x
    x = 8,847,126,811.45/85,685.45
  6. Step 6: Final answer
    x = 103,251.22

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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.