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Finding the Fourth Proportional to 93.49, 139.56 and 81.34

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Solution

The fourth proportional to 93.49, 139.56 and 81.34 is: 121.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.49 : 139.56 = 81.34 : x
  2. Step 2: Convert to fraction form
    93.49/139.56 = 81.34/x
  3. Step 3: Cross multiply
    93.49x = 139.56 × 81.34
  4. Step 4: Simplify right side
    93.49x = 11,350.71
  5. Step 5: Solve for x
    x = 11,350.71/93.49
  6. Step 6: Final answer
    x = 121.42

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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.