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Finding the Fourth Proportional to 193.31, 289.97 and 71.43

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Solution

The fourth proportional to 193.31, 289.97 and 71.43 is: 107.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.31 : 289.97 = 71.43 : x
  2. Step 2: Convert to fraction form
    193.31/289.97 = 71.43/x
  3. Step 3: Cross multiply
    193.31x = 289.97 × 71.43
  4. Step 4: Simplify right side
    193.31x = 20,712.20
  5. Step 5: Solve for x
    x = 20,712.20/193.31
  6. Step 6: Final answer
    x = 107.15

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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.