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Finding the Fourth Proportional to 93.14, 139.87 and 81.22

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Solution

The fourth proportional to 93.14, 139.87 and 81.22 is: 121.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.14 : 139.87 = 81.22 : x
  2. Step 2: Convert to fraction form
    93.14/139.87 = 81.22/x
  3. Step 3: Cross multiply
    93.14x = 139.87 × 81.22
  4. Step 4: Simplify right side
    93.14x = 11,360.24
  5. Step 5: Solve for x
    x = 11,360.24/93.14
  6. Step 6: Final answer
    x = 121.97

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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.