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Finding the Fourth Proportional to 93.89, 128.97 and 76.34

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Solution

The fourth proportional to 93.89, 128.97 and 76.34 is: 104.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.89 : 128.97 = 76.34 : x
  2. Step 2: Convert to fraction form
    93.89/128.97 = 76.34/x
  3. Step 3: Cross multiply
    93.89x = 128.97 × 76.34
  4. Step 4: Simplify right side
    93.89x = 9,845.89
  5. Step 5: Solve for x
    x = 9,845.89/93.89
  6. Step 6: Final answer
    x = 104.86

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.