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Finding the Fourth Proportional to 78,876.72, 108,965.03 and 68,247.90

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Solution

The fourth proportional to 78,876.72, 108,965.03 and 68,247.90 is: 94,281.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,876.72 : 108,965.03 = 68,247.90 : x
  2. Step 2: Convert to fraction form
    78,876.72/108,965.03 = 68,247.90/x
  3. Step 3: Cross multiply
    78,876.72x = 108,965.03 × 68,247.90
  4. Step 4: Simplify right side
    78,876.72x = 7,436,634,129.70
  5. Step 5: Solve for x
    x = 7,436,634,129.70/78,876.72
  6. Step 6: Final answer
    x = 94,281.74

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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.