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Finding the Fourth Proportional to 193.25, 289.60 and 71.39

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Solution

The fourth proportional to 193.25, 289.60 and 71.39 is: 106.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.25 : 289.60 = 71.39 : x
  2. Step 2: Convert to fraction form
    193.25/289.60 = 71.39/x
  3. Step 3: Cross multiply
    193.25x = 289.60 × 71.39
  4. Step 4: Simplify right side
    193.25x = 20,674.54
  5. Step 5: Solve for x
    x = 20,674.54/193.25
  6. Step 6: Final answer
    x = 106.98

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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.