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Finding the Fourth Proportional to 135.68, 203.09 and 86.97

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Solution

The fourth proportional to 135.68, 203.09 and 86.97 is: 130.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.68 : 203.09 = 86.97 : x
  2. Step 2: Convert to fraction form
    135.68/203.09 = 86.97/x
  3. Step 3: Cross multiply
    135.68x = 203.09 × 86.97
  4. Step 4: Simplify right side
    135.68x = 17,662.74
  5. Step 5: Solve for x
    x = 17,662.74/135.68
  6. Step 6: Final answer
    x = 130.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.