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Finding the Fourth Proportional to 136.30, 188.09 and 81.01

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Solution

The fourth proportional to 136.30, 188.09 and 81.01 is: 111.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.30 : 188.09 = 81.01 : x
  2. Step 2: Convert to fraction form
    136.30/188.09 = 81.01/x
  3. Step 3: Cross multiply
    136.30x = 188.09 × 81.01
  4. Step 4: Simplify right side
    136.30x = 15,236.77
  5. Step 5: Solve for x
    x = 15,236.77/136.30
  6. Step 6: Final answer
    x = 111.79

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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.