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Finding the Fourth Proportional to 93.87, 140.81 and 76.90

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Solution

The fourth proportional to 93.87, 140.81 and 76.90 is: 115.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.87 : 140.81 = 76.90 : x
  2. Step 2: Convert to fraction form
    93.87/140.81 = 76.90/x
  3. Step 3: Cross multiply
    93.87x = 140.81 × 76.90
  4. Step 4: Simplify right side
    93.87x = 10,828.29
  5. Step 5: Solve for x
    x = 10,828.29/93.87
  6. Step 6: Final answer
    x = 115.35

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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.