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Finding the Fourth Proportional to 192.30, 288.30 and 76.62

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Solution

The fourth proportional to 192.30, 288.30 and 76.62 is: 114.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.30 : 288.30 = 76.62 : x
  2. Step 2: Convert to fraction form
    192.30/288.30 = 76.62/x
  3. Step 3: Cross multiply
    192.30x = 288.30 × 76.62
  4. Step 4: Simplify right side
    192.30x = 22,089.55
  5. Step 5: Solve for x
    x = 22,089.55/192.30
  6. Step 6: Final answer
    x = 114.87

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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.