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Finding the Fourth Proportional to 134.45, 201.27 and 86.39

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Solution

The fourth proportional to 134.45, 201.27 and 86.39 is: 129.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.45 : 201.27 = 86.39 : x
  2. Step 2: Convert to fraction form
    134.45/201.27 = 86.39/x
  3. Step 3: Cross multiply
    134.45x = 201.27 × 86.39
  4. Step 4: Simplify right side
    134.45x = 17,387.72
  5. Step 5: Solve for x
    x = 17,387.72/134.45
  6. Step 6: Final answer
    x = 129.32

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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.