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Finding the Fourth Proportional to 192.96, 289.46 and 71.21

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Solution

The fourth proportional to 192.96, 289.46 and 71.21 is: 106.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.96 : 289.46 = 71.21 : x
  2. Step 2: Convert to fraction form
    192.96/289.46 = 71.21/x
  3. Step 3: Cross multiply
    192.96x = 289.46 × 71.21
  4. Step 4: Simplify right side
    192.96x = 20,611.00
  5. Step 5: Solve for x
    x = 20,611.00/192.96
  6. Step 6: Final answer
    x = 106.82

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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.