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Finding the Fourth Proportional to 93.11, 138.87 and 81.43

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Solution

The fourth proportional to 93.11, 138.87 and 81.43 is: 121.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.11 : 138.87 = 81.43 : x
  2. Step 2: Convert to fraction form
    93.11/138.87 = 81.43/x
  3. Step 3: Cross multiply
    93.11x = 138.87 × 81.43
  4. Step 4: Simplify right side
    93.11x = 11,307.84
  5. Step 5: Solve for x
    x = 11,307.84/93.11
  6. Step 6: Final answer
    x = 121.45

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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.