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Finding the Fourth Proportional to 193.72, 267.16 and 138.64

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Solution

The fourth proportional to 193.72, 267.16 and 138.64 is: 191.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.72 : 267.16 = 138.64 : x
  2. Step 2: Convert to fraction form
    193.72/267.16 = 138.64/x
  3. Step 3: Cross multiply
    193.72x = 267.16 × 138.64
  4. Step 4: Simplify right side
    193.72x = 37,039.06
  5. Step 5: Solve for x
    x = 37,039.06/193.72
  6. Step 6: Final answer
    x = 191.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.