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Finding the Fourth Proportional to 71,639.66, 107,445.71 and 68,083.54

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Solution

The fourth proportional to 71,639.66, 107,445.71 and 68,083.54 is: 102,112.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,639.66 : 107,445.71 = 68,083.54 : x
  2. Step 2: Convert to fraction form
    71,639.66/107,445.71 = 68,083.54/x
  3. Step 3: Cross multiply
    71,639.66x = 107,445.71 × 68,083.54
  4. Step 4: Simplify right side
    71,639.66x = 7,315,284,196.21
  5. Step 5: Solve for x
    x = 7,315,284,196.21/71,639.66
  6. Step 6: Final answer
    x = 102,112.21

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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.