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Finding the Fourth Proportional to 68,079.05, 93,943.49 and 39,400.80

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Solution

The fourth proportional to 68,079.05, 93,943.49 and 39,400.80 is: 54,369.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,079.05 : 93,943.49 = 39,400.80 : x
  2. Step 2: Convert to fraction form
    68,079.05/93,943.49 = 39,400.80/x
  3. Step 3: Cross multiply
    68,079.05x = 93,943.49 × 39,400.80
  4. Step 4: Simplify right side
    68,079.05x = 3,701,448,111.50
  5. Step 5: Solve for x
    x = 3,701,448,111.50/68,079.05
  6. Step 6: Final answer
    x = 54,369.86

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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.