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Finding the Fourth Proportional to 85,939.44, 129,003.36 and 68,283.60

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Solution

The fourth proportional to 85,939.44, 129,003.36 and 68,283.60 is: 102,500.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,939.44 : 129,003.36 = 68,283.60 : x
  2. Step 2: Convert to fraction form
    85,939.44/129,003.36 = 68,283.60/x
  3. Step 3: Cross multiply
    85,939.44x = 129,003.36 × 68,283.60
  4. Step 4: Simplify right side
    85,939.44x = 8,808,813,832.90
  5. Step 5: Solve for x
    x = 8,808,813,832.90/85,939.44
  6. Step 6: Final answer
    x = 102,500.25

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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.