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Finding the Fourth Proportional to 68,663.25, 94,747.31 and 39,989.18

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Solution

The fourth proportional to 68,663.25, 94,747.31 and 39,989.18 is: 55,180.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,663.25 : 94,747.31 = 39,989.18 : x
  2. Step 2: Convert to fraction form
    68,663.25/94,747.31 = 39,989.18/x
  3. Step 3: Cross multiply
    68,663.25x = 94,747.31 × 39,989.18
  4. Step 4: Simplify right side
    68,663.25x = 3,788,866,888.03
  5. Step 5: Solve for x
    x = 3,788,866,888.03/68,663.25
  6. Step 6: Final answer
    x = 55,180.42

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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.