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Finding the Fourth Proportional to 192.15, 287.82 and 155.70

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Solution

The fourth proportional to 192.15, 287.82 and 155.70 is: 233.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.15 : 287.82 = 155.70 : x
  2. Step 2: Convert to fraction form
    192.15/287.82 = 155.70/x
  3. Step 3: Cross multiply
    192.15x = 287.82 × 155.70
  4. Step 4: Simplify right side
    192.15x = 44,813.57
  5. Step 5: Solve for x
    x = 44,813.57/192.15
  6. Step 6: Final answer
    x = 233.22

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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.