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Finding the Fourth Proportional to 137.30, 206.05 and 86.02

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Solution

The fourth proportional to 137.30, 206.05 and 86.02 is: 129.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.30 : 206.05 = 86.02 : x
  2. Step 2: Convert to fraction form
    137.30/206.05 = 86.02/x
  3. Step 3: Cross multiply
    137.30x = 206.05 × 86.02
  4. Step 4: Simplify right side
    137.30x = 17,723.69
  5. Step 5: Solve for x
    x = 17,723.69/137.30
  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.