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Finding the Fourth Proportional to 93.90, 140.79 and 39.87

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Solution

The fourth proportional to 93.90, 140.79 and 39.87 is: 59.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.90 : 140.79 = 39.87 : x
  2. Step 2: Convert to fraction form
    93.90/140.79 = 39.87/x
  3. Step 3: Cross multiply
    93.90x = 140.79 × 39.87
  4. Step 4: Simplify right side
    93.90x = 5,613.30
  5. Step 5: Solve for x
    x = 5,613.30/93.90
  6. Step 6: Final answer
    x = 59.78

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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.