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Finding the Fourth Proportional to 137.39, 206.04 and 86.34

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Solution

The fourth proportional to 137.39, 206.04 and 86.34 is: 129.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.39 : 206.04 = 86.34 : x
  2. Step 2: Convert to fraction form
    137.39/206.04 = 86.34/x
  3. Step 3: Cross multiply
    137.39x = 206.04 × 86.34
  4. Step 4: Simplify right side
    137.39x = 17,789.49
  5. Step 5: Solve for x
    x = 17,789.49/137.39
  6. Step 6: Final answer
    x = 129.49

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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.