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Finding the Fourth Proportional to 192.11, 287.78 and 89.25

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Solution

The fourth proportional to 192.11, 287.78 and 89.25 is: 133.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.11 : 287.78 = 89.25 : x
  2. Step 2: Convert to fraction form
    192.11/287.78 = 89.25/x
  3. Step 3: Cross multiply
    192.11x = 287.78 × 89.25
  4. Step 4: Simplify right side
    192.11x = 25,684.96
  5. Step 5: Solve for x
    x = 25,684.96/192.11
  6. Step 6: Final answer
    x = 133.70

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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.