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Finding the Fourth Proportional to 136.98, 188.97 and 87.18

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Solution

The fourth proportional to 136.98, 188.97 and 87.18 is: 120.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.98 : 188.97 = 87.18 : x
  2. Step 2: Convert to fraction form
    136.98/188.97 = 87.18/x
  3. Step 3: Cross multiply
    136.98x = 188.97 × 87.18
  4. Step 4: Simplify right side
    136.98x = 16,474.40
  5. Step 5: Solve for x
    x = 16,474.40/136.98
  6. Step 6: Final answer
    x = 120.27

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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.