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Finding the Fourth Proportional to 193.31, 266.78 and 115.69

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Solution

The fourth proportional to 193.31, 266.78 and 115.69 is: 159.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.31 : 266.78 = 115.69 : x
  2. Step 2: Convert to fraction form
    193.31/266.78 = 115.69/x
  3. Step 3: Cross multiply
    193.31x = 266.78 × 115.69
  4. Step 4: Simplify right side
    193.31x = 30,862.53
  5. Step 5: Solve for x
    x = 30,862.53/193.31
  6. Step 6: Final answer
    x = 159.65

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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.