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Finding the Fourth Proportional to 85,861.76, 118,541.76 and 68,028.80

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Solution

The fourth proportional to 85,861.76, 118,541.76 and 68,028.80 is: 93,921.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,861.76 : 118,541.76 = 68,028.80 : x
  2. Step 2: Convert to fraction form
    85,861.76/118,541.76 = 68,028.80/x
  3. Step 3: Cross multiply
    85,861.76x = 118,541.76 × 68,028.80
  4. Step 4: Simplify right side
    85,861.76x = 8,064,253,682.69
  5. Step 5: Solve for x
    x = 8,064,253,682.69/85,861.76
  6. Step 6: Final answer
    x = 93,921.36

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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.