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Finding the Fourth Proportional to 94.08, 140.72 and 76.88

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Solution

The fourth proportional to 94.08, 140.72 and 76.88 is: 114.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.08 : 140.72 = 76.88 : x
  2. Step 2: Convert to fraction form
    94.08/140.72 = 76.88/x
  3. Step 3: Cross multiply
    94.08x = 140.72 × 76.88
  4. Step 4: Simplify right side
    94.08x = 10,818.55
  5. Step 5: Solve for x
    x = 10,818.55/94.08
  6. Step 6: Final answer
    x = 114.99

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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.