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Finding the Fourth Proportional to 192.78, 289.10 and 84.50

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Solution

The fourth proportional to 192.78, 289.10 and 84.50 is: 126.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.78 : 289.10 = 84.50 : x
  2. Step 2: Convert to fraction form
    192.78/289.10 = 84.50/x
  3. Step 3: Cross multiply
    192.78x = 289.10 × 84.50
  4. Step 4: Simplify right side
    192.78x = 24,428.95
  5. Step 5: Solve for x
    x = 24,428.95/192.78
  6. Step 6: Final answer
    x = 126.72

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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.