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Finding the Fourth Proportional to 116.96, 175.17 and 80.78

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Solution

The fourth proportional to 116.96, 175.17 and 80.78 is: 120.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.96 : 175.17 = 80.78 : x
  2. Step 2: Convert to fraction form
    116.96/175.17 = 80.78/x
  3. Step 3: Cross multiply
    116.96x = 175.17 × 80.78
  4. Step 4: Simplify right side
    116.96x = 14,150.23
  5. Step 5: Solve for x
    x = 14,150.23/116.96
  6. Step 6: Final answer
    x = 120.98

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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.