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Finding the Fourth Proportional to 93.89, 140.15 and 81.13

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Solution

The fourth proportional to 93.89, 140.15 and 81.13 is: 121.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.89 : 140.15 = 81.13 : x
  2. Step 2: Convert to fraction form
    93.89/140.15 = 81.13/x
  3. Step 3: Cross multiply
    93.89x = 140.15 × 81.13
  4. Step 4: Simplify right side
    93.89x = 11,370.90
  5. Step 5: Solve for x
    x = 11,370.90/93.89
  6. Step 6: Final answer
    x = 121.11

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.