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Finding the Fourth Proportional to 71,040.80, 106,618.80 and 68,736.80

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Solution

The fourth proportional to 71,040.80, 106,618.80 and 68,736.80 is: 103,160.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,040.80 : 106,618.80 = 68,736.80 : x
  2. Step 2: Convert to fraction form
    71,040.80/106,618.80 = 68,736.80/x
  3. Step 3: Cross multiply
    71,040.80x = 106,618.80 × 68,736.80
  4. Step 4: Simplify right side
    71,040.80x = 7,328,635,131.84
  5. Step 5: Solve for x
    x = 7,328,635,131.84/71,040.80
  6. Step 6: Final answer
    x = 103,160.93

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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.