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Finding the Fourth Proportional to 190.81, 285.98 and 122.46

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Solution

The fourth proportional to 190.81, 285.98 and 122.46 is: 183.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.81 : 285.98 = 122.46 : x
  2. Step 2: Convert to fraction form
    190.81/285.98 = 122.46/x
  3. Step 3: Cross multiply
    190.81x = 285.98 × 122.46
  4. Step 4: Simplify right side
    190.81x = 35,021.72
  5. Step 5: Solve for x
    x = 35,021.72/190.81
  6. Step 6: Final answer
    x = 183.55

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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.