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Finding the Fourth Proportional to 93.97, 128.92 and 89.38

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Solution

The fourth proportional to 93.97, 128.92 and 89.38 is: 122.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.97 : 128.92 = 89.38 : x
  2. Step 2: Convert to fraction form
    93.97/128.92 = 89.38/x
  3. Step 3: Cross multiply
    93.97x = 128.92 × 89.38
  4. Step 4: Simplify right side
    93.97x = 11,522.87
  5. Step 5: Solve for x
    x = 11,522.87/93.97
  6. Step 6: Final answer
    x = 122.62

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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.