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Finding the Fourth Proportional to 190.50, 262.95 and 121.50

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Solution

The fourth proportional to 190.50, 262.95 and 121.50 is: 167.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.50 : 262.95 = 121.50 : x
  2. Step 2: Convert to fraction form
    190.50/262.95 = 121.50/x
  3. Step 3: Cross multiply
    190.50x = 262.95 × 121.50
  4. Step 4: Simplify right side
    190.50x = 31,948.43
  5. Step 5: Solve for x
    x = 31,948.43/190.50
  6. Step 6: Final answer
    x = 167.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.