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Finding the Fourth Proportional to 192.52, 288.60 and 76.90

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Solution

The fourth proportional to 192.52, 288.60 and 76.90 is: 115.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.52 : 288.60 = 76.90 : x
  2. Step 2: Convert to fraction form
    192.52/288.60 = 76.90/x
  3. Step 3: Cross multiply
    192.52x = 288.60 × 76.90
  4. Step 4: Simplify right side
    192.52x = 22,193.34
  5. Step 5: Solve for x
    x = 22,193.34/192.52
  6. Step 6: Final answer
    x = 115.28

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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.