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Finding the Fourth Proportional to 193.19, 289.78 and 71.31

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Solution

The fourth proportional to 193.19, 289.78 and 71.31 is: 106.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.19 : 289.78 = 71.31 : x
  2. Step 2: Convert to fraction form
    193.19/289.78 = 71.31/x
  3. Step 3: Cross multiply
    193.19x = 289.78 × 71.31
  4. Step 4: Simplify right side
    193.19x = 20,662.68
  5. Step 5: Solve for x
    x = 20,662.68/193.19
  6. Step 6: Final answer
    x = 106.96

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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.