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Finding the Fourth Proportional to 138.64, 206.93 and 122.44

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Solution

The fourth proportional to 138.64, 206.93 and 122.44 is: 182.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.64 : 206.93 = 122.44 : x
  2. Step 2: Convert to fraction form
    138.64/206.93 = 122.44/x
  3. Step 3: Cross multiply
    138.64x = 206.93 × 122.44
  4. Step 4: Simplify right side
    138.64x = 25,336.51
  5. Step 5: Solve for x
    x = 25,336.51/138.64
  6. Step 6: Final answer
    x = 182.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.