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Finding the Fourth Proportional to 68,715, 94,826.70 and 38,907

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Solution

The fourth proportional to 68,715, 94,826.70 and 38,907 is: 53,691.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,715 : 94,826.70 = 38,907 : x
  2. Step 2: Convert to fraction form
    68,715/94,826.70 = 38,907/x
  3. Step 3: Cross multiply
    68,715x = 94,826.70 × 38,907
  4. Step 4: Simplify right side
    68,715x = 3,689,422,416.90
  5. Step 5: Solve for x
    x = 3,689,422,416.90/68,715
  6. Step 6: Final answer
    x = 53,691.66

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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.