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Finding the Fourth Proportional to 136.88, 189.23 and 131.15

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Solution

The fourth proportional to 136.88, 189.23 and 131.15 is: 181.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.88 : 189.23 = 131.15 : x
  2. Step 2: Convert to fraction form
    136.88/189.23 = 131.15/x
  3. Step 3: Cross multiply
    136.88x = 189.23 × 131.15
  4. Step 4: Simplify right side
    136.88x = 24,815.91
  5. Step 5: Solve for x
    x = 24,815.91/136.88
  6. Step 6: Final answer
    x = 181.30

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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.