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Finding the Fourth Proportional to 93.90, 140.35 and 81.61

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Solution

The fourth proportional to 93.90, 140.35 and 81.61 is: 121.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.90 : 140.35 = 81.61 : x
  2. Step 2: Convert to fraction form
    93.90/140.35 = 81.61/x
  3. Step 3: Cross multiply
    93.90x = 140.35 × 81.61
  4. Step 4: Simplify right side
    93.90x = 11,453.76
  5. Step 5: Solve for x
    x = 11,453.76/93.90
  6. Step 6: Final answer
    x = 121.98

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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.