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Finding the Fourth Proportional to 192.72, 289.12 and 71.04

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Solution

The fourth proportional to 192.72, 289.12 and 71.04 is: 106.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.72 : 289.12 = 71.04 : x
  2. Step 2: Convert to fraction form
    192.72/289.12 = 71.04/x
  3. Step 3: Cross multiply
    192.72x = 289.12 × 71.04
  4. Step 4: Simplify right side
    192.72x = 20,539.08
  5. Step 5: Solve for x
    x = 20,539.08/192.72
  6. Step 6: Final answer
    x = 106.57

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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.