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Finding the Fourth Proportional to 192.42, 288.49 and 84.15

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Solution

The fourth proportional to 192.42, 288.49 and 84.15 is: 126.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.42 : 288.49 = 84.15 : x
  2. Step 2: Convert to fraction form
    192.42/288.49 = 84.15/x
  3. Step 3: Cross multiply
    192.42x = 288.49 × 84.15
  4. Step 4: Simplify right side
    192.42x = 24,276.43
  5. Step 5: Solve for x
    x = 24,276.43/192.42
  6. Step 6: Final answer
    x = 126.16

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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.