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Finding the Fourth Proportional to 136.25, 187.90 and 105.11

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Solution

The fourth proportional to 136.25, 187.90 and 105.11 is: 144.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.25 : 187.90 = 105.11 : x
  2. Step 2: Convert to fraction form
    136.25/187.90 = 105.11/x
  3. Step 3: Cross multiply
    136.25x = 187.90 × 105.11
  4. Step 4: Simplify right side
    136.25x = 19,750.17
  5. Step 5: Solve for x
    x = 19,750.17/136.25
  6. Step 6: Final answer
    x = 144.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.