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Finding the Fourth Proportional to 93.99, 140.85 and 39.86

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Solution

The fourth proportional to 93.99, 140.85 and 39.86 is: 59.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.99 : 140.85 = 39.86 : x
  2. Step 2: Convert to fraction form
    93.99/140.85 = 39.86/x
  3. Step 3: Cross multiply
    93.99x = 140.85 × 39.86
  4. Step 4: Simplify right side
    93.99x = 5,613.58
  5. Step 5: Solve for x
    x = 5,613.58/93.99
  6. Step 6: Final answer
    x = 59.73

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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.