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Finding the Fourth Proportional to 190.74, 286.56 and 122.40

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Solution

The fourth proportional to 190.74, 286.56 and 122.40 is: 183.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.74 : 286.56 = 122.40 : x
  2. Step 2: Convert to fraction form
    190.74/286.56 = 122.40/x
  3. Step 3: Cross multiply
    190.74x = 286.56 × 122.40
  4. Step 4: Simplify right side
    190.74x = 35,074.94
  5. Step 5: Solve for x
    x = 35,074.94/190.74
  6. Step 6: Final answer
    x = 183.89

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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.