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Finding the Fourth Proportional to 117.14, 174.36 and 115.40

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Solution

The fourth proportional to 117.14, 174.36 and 115.40 is: 171.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.14 : 174.36 = 115.40 : x
  2. Step 2: Convert to fraction form
    117.14/174.36 = 115.40/x
  3. Step 3: Cross multiply
    117.14x = 174.36 × 115.40
  4. Step 4: Simplify right side
    117.14x = 20,121.15
  5. Step 5: Solve for x
    x = 20,121.15/117.14
  6. Step 6: Final answer
    x = 171.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.