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Finding the Fourth Proportional to 78,491.92, 108,604.08 and 68,441.30

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Solution

The fourth proportional to 78,491.92, 108,604.08 and 68,441.30 is: 94,697.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,491.92 : 108,604.08 = 68,441.30 : x
  2. Step 2: Convert to fraction form
    78,491.92/108,604.08 = 68,441.30/x
  3. Step 3: Cross multiply
    78,491.92x = 108,604.08 × 68,441.30
  4. Step 4: Simplify right side
    78,491.92x = 7,433,004,692.01
  5. Step 5: Solve for x
    x = 7,433,004,692.01/78,491.92
  6. Step 6: Final answer
    x = 94,697.71

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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.