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Finding the Fourth Proportional to 85,912.95, 128,817.44 and 38,519.25

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Solution

The fourth proportional to 85,912.95, 128,817.44 and 38,519.25 is: 57,755.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,912.95 : 128,817.44 = 38,519.25 : x
  2. Step 2: Convert to fraction form
    85,912.95/128,817.44 = 38,519.25/x
  3. Step 3: Cross multiply
    85,912.95x = 128,817.44 × 38,519.25
  4. Step 4: Simplify right side
    85,912.95x = 4,961,950,644.51
  5. Step 5: Solve for x
    x = 4,961,950,644.51/85,912.95
  6. Step 6: Final answer
    x = 57,755.56

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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.