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Finding the Fourth Proportional to 193.55, 290.24 and 71.85

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Solution

The fourth proportional to 193.55, 290.24 and 71.85 is: 107.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.55 : 290.24 = 71.85 : x
  2. Step 2: Convert to fraction form
    193.55/290.24 = 71.85/x
  3. Step 3: Cross multiply
    193.55x = 290.24 × 71.85
  4. Step 4: Simplify right side
    193.55x = 20,853.38
  5. Step 5: Solve for x
    x = 20,853.38/193.55
  6. Step 6: Final answer
    x = 107.74

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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.