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Finding the Fourth Proportional to 137.66, 206.40 and 69.22

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Solution

The fourth proportional to 137.66, 206.40 and 69.22 is: 103.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.66 : 206.40 = 69.22 : x
  2. Step 2: Convert to fraction form
    137.66/206.40 = 69.22/x
  3. Step 3: Cross multiply
    137.66x = 206.40 × 69.22
  4. Step 4: Simplify right side
    137.66x = 14,287.01
  5. Step 5: Solve for x
    x = 14,287.01/137.66
  6. Step 6: Final answer
    x = 103.78

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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.