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Finding the Fourth Proportional to 192.28, 287.90 and 100.78

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Solution

The fourth proportional to 192.28, 287.90 and 100.78 is: 150.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.28 : 287.90 = 100.78 : x
  2. Step 2: Convert to fraction form
    192.28/287.90 = 100.78/x
  3. Step 3: Cross multiply
    192.28x = 287.90 × 100.78
  4. Step 4: Simplify right side
    192.28x = 29,015.53
  5. Step 5: Solve for x
    x = 29,015.53/192.28
  6. Step 6: Final answer
    x = 150.90

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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.