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Finding the Fourth Proportional to 93.92, 140.88 and 80.48

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Solution

The fourth proportional to 93.92, 140.88 and 80.48 is: 120.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.92 : 140.88 = 80.48 : x
  2. Step 2: Convert to fraction form
    93.92/140.88 = 80.48/x
  3. Step 3: Cross multiply
    93.92x = 140.88 × 80.48
  4. Step 4: Simplify right side
    93.92x = 11,338.02
  5. Step 5: Solve for x
    x = 11,338.02/93.92
  6. Step 6: Final answer
    x = 120.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.