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Finding the Fourth Proportional to 136.19, 187.91 and 87.14

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Solution

The fourth proportional to 136.19, 187.91 and 87.14 is: 120.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.19 : 187.91 = 87.14 : x
  2. Step 2: Convert to fraction form
    136.19/187.91 = 87.14/x
  3. Step 3: Cross multiply
    136.19x = 187.91 × 87.14
  4. Step 4: Simplify right side
    136.19x = 16,374.48
  5. Step 5: Solve for x
    x = 16,374.48/136.19
  6. Step 6: Final answer
    x = 120.23

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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.