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Finding the Fourth Proportional to 117.67, 176.64 and 115.78

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Solution

The fourth proportional to 117.67, 176.64 and 115.78 is: 173.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.67 : 176.64 = 115.78 : x
  2. Step 2: Convert to fraction form
    117.67/176.64 = 115.78/x
  3. Step 3: Cross multiply
    117.67x = 176.64 × 115.78
  4. Step 4: Simplify right side
    117.67x = 20,451.38
  5. Step 5: Solve for x
    x = 20,451.38/117.67
  6. Step 6: Final answer
    x = 173.80

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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.