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Finding the Fourth Proportional to 137.08, 205.74 and 115.72

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Solution

The fourth proportional to 137.08, 205.74 and 115.72 is: 173.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.08 : 205.74 = 115.72 : x
  2. Step 2: Convert to fraction form
    137.08/205.74 = 115.72/x
  3. Step 3: Cross multiply
    137.08x = 205.74 × 115.72
  4. Step 4: Simplify right side
    137.08x = 23,808.23
  5. Step 5: Solve for x
    x = 23,808.23/137.08
  6. Step 6: Final answer
    x = 173.68

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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.