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Finding the Fourth Proportional to 93.98, 140.82 and 85.88

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Solution

The fourth proportional to 93.98, 140.82 and 85.88 is: 128.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.98 : 140.82 = 85.88 : x
  2. Step 2: Convert to fraction form
    93.98/140.82 = 85.88/x
  3. Step 3: Cross multiply
    93.98x = 140.82 × 85.88
  4. Step 4: Simplify right side
    93.98x = 12,093.62
  5. Step 5: Solve for x
    x = 12,093.62/93.98
  6. Step 6: Final answer
    x = 128.68

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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.