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Finding the Fourth Proportional to 135.05, 202.38 and 86.15

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Solution

The fourth proportional to 135.05, 202.38 and 86.15 is: 129.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.05 : 202.38 = 86.15 : x
  2. Step 2: Convert to fraction form
    135.05/202.38 = 86.15/x
  3. Step 3: Cross multiply
    135.05x = 202.38 × 86.15
  4. Step 4: Simplify right side
    135.05x = 17,434.24
  5. Step 5: Solve for x
    x = 17,434.24/135.05
  6. Step 6: Final answer
    x = 129.09

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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.