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Finding the Fourth Proportional to 193.06, 289.16 and 138.78

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Solution

The fourth proportional to 193.06, 289.16 and 138.78 is: 207.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.06 : 289.16 = 138.78 : x
  2. Step 2: Convert to fraction form
    193.06/289.16 = 138.78/x
  3. Step 3: Cross multiply
    193.06x = 289.16 × 138.78
  4. Step 4: Simplify right side
    193.06x = 40,129.62
  5. Step 5: Solve for x
    x = 40,129.62/193.06
  6. Step 6: Final answer
    x = 207.86

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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.