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Finding the Fourth Proportional to 136.09, 187.72 and 84.25

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Solution

The fourth proportional to 136.09, 187.72 and 84.25 is: 116.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.09 : 187.72 = 84.25 : x
  2. Step 2: Convert to fraction form
    136.09/187.72 = 84.25/x
  3. Step 3: Cross multiply
    136.09x = 187.72 × 84.25
  4. Step 4: Simplify right side
    136.09x = 15,815.41
  5. Step 5: Solve for x
    x = 15,815.41/136.09
  6. Step 6: Final answer
    x = 116.21

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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.