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Finding the Fourth Proportional to 117.25, 175.84 and 115.78

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Solution

The fourth proportional to 117.25, 175.84 and 115.78 is: 173.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.25 : 175.84 = 115.78 : x
  2. Step 2: Convert to fraction form
    117.25/175.84 = 115.78/x
  3. Step 3: Cross multiply
    117.25x = 175.84 × 115.78
  4. Step 4: Simplify right side
    117.25x = 20,358.36
  5. Step 5: Solve for x
    x = 20,358.36/117.25
  6. Step 6: Final answer
    x = 173.64

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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.