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Finding the Fourth Proportional to 93.85, 129.39 and 80.68

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Solution

The fourth proportional to 93.85, 129.39 and 80.68 is: 111.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.85 : 129.39 = 80.68 : x
  2. Step 2: Convert to fraction form
    93.85/129.39 = 80.68/x
  3. Step 3: Cross multiply
    93.85x = 129.39 × 80.68
  4. Step 4: Simplify right side
    93.85x = 10,439.19
  5. Step 5: Solve for x
    x = 10,439.19/93.85
  6. Step 6: Final answer
    x = 111.23

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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.