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Finding the Fourth Proportional to 137.90, 206.01 and 115.11

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Solution

The fourth proportional to 137.90, 206.01 and 115.11 is: 171.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.90 : 206.01 = 115.11 : x
  2. Step 2: Convert to fraction form
    137.90/206.01 = 115.11/x
  3. Step 3: Cross multiply
    137.90x = 206.01 × 115.11
  4. Step 4: Simplify right side
    137.90x = 23,713.81
  5. Step 5: Solve for x
    x = 23,713.81/137.90
  6. Step 6: Final answer
    x = 171.96

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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.