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Finding the Fourth Proportional to 134.39, 201.38 and 86.20

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Solution

The fourth proportional to 134.39, 201.38 and 86.20 is: 129.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.39 : 201.38 = 86.20 : x
  2. Step 2: Convert to fraction form
    134.39/201.38 = 86.20/x
  3. Step 3: Cross multiply
    134.39x = 201.38 × 86.20
  4. Step 4: Simplify right side
    134.39x = 17,358.02
  5. Step 5: Solve for x
    x = 17,358.02/134.39
  6. Step 6: Final answer
    x = 129.16

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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.