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Finding the Fourth Proportional to 136.14, 187.70 and 86.94

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Solution

The fourth proportional to 136.14, 187.70 and 86.94 is: 119.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.14 : 187.70 = 86.94 : x
  2. Step 2: Convert to fraction form
    136.14/187.70 = 86.94/x
  3. Step 3: Cross multiply
    136.14x = 187.70 × 86.94
  4. Step 4: Simplify right side
    136.14x = 16,317.70
  5. Step 5: Solve for x
    x = 16,317.70/136.14
  6. Step 6: Final answer
    x = 119.86

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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.