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Finding the Fourth Proportional to 193.81, 290.82 and 72.15

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Solution

The fourth proportional to 193.81, 290.82 and 72.15 is: 108.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.81 : 290.82 = 72.15 : x
  2. Step 2: Convert to fraction form
    193.81/290.82 = 72.15/x
  3. Step 3: Cross multiply
    193.81x = 290.82 × 72.15
  4. Step 4: Simplify right side
    193.81x = 20,982.30
  5. Step 5: Solve for x
    x = 20,982.30/193.81
  6. Step 6: Final answer
    x = 108.27

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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.