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Finding the Fourth Proportional to 190.36, 262.74 and 112.78

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Solution

The fourth proportional to 190.36, 262.74 and 112.78 is: 155.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.36 : 262.74 = 112.78 : x
  2. Step 2: Convert to fraction form
    190.36/262.74 = 112.78/x
  3. Step 3: Cross multiply
    190.36x = 262.74 × 112.78
  4. Step 4: Simplify right side
    190.36x = 29,631.82
  5. Step 5: Solve for x
    x = 29,631.82/190.36
  6. Step 6: Final answer
    x = 155.66

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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.