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Finding the Fourth Proportional to 85,399.76, 117,817.80 and 57,060.56

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Solution

The fourth proportional to 85,399.76, 117,817.80 and 57,060.56 is: 78,720.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,399.76 : 117,817.80 = 57,060.56 : x
  2. Step 2: Convert to fraction form
    85,399.76/117,817.80 = 57,060.56/x
  3. Step 3: Cross multiply
    85,399.76x = 117,817.80 × 57,060.56
  4. Step 4: Simplify right side
    85,399.76x = 6,722,749,645.97
  5. Step 5: Solve for x
    x = 6,722,749,645.97/85,399.76
  6. Step 6: Final answer
    x = 78,720.94

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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.