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Finding the Fourth Proportional to 192.96, 289.35 and 84.78

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Solution

The fourth proportional to 192.96, 289.35 and 84.78 is: 127.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.96 : 289.35 = 84.78 : x
  2. Step 2: Convert to fraction form
    192.96/289.35 = 84.78/x
  3. Step 3: Cross multiply
    192.96x = 289.35 × 84.78
  4. Step 4: Simplify right side
    192.96x = 24,531.09
  5. Step 5: Solve for x
    x = 24,531.09/192.96
  6. Step 6: Final answer
    x = 127.13

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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.