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Finding the Fourth Proportional to 68,321.78, 94,279.44 and 39,642.31

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Solution

The fourth proportional to 68,321.78, 94,279.44 and 39,642.31 is: 54,703.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,321.78 : 94,279.44 = 39,642.31 : x
  2. Step 2: Convert to fraction form
    68,321.78/94,279.44 = 39,642.31/x
  3. Step 3: Cross multiply
    68,321.78x = 94,279.44 × 39,642.31
  4. Step 4: Simplify right side
    68,321.78x = 3,737,455,053.61
  5. Step 5: Solve for x
    x = 3,737,455,053.61/68,321.78
  6. Step 6: Final answer
    x = 54,703.71

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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.