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Finding the Fourth Proportional to 190.12, 262.10 and 121

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Solution

The fourth proportional to 190.12, 262.10 and 121 is: 166.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.12 : 262.10 = 121 : x
  2. Step 2: Convert to fraction form
    190.12/262.10 = 121/x
  3. Step 3: Cross multiply
    190.12x = 262.10 × 121
  4. Step 4: Simplify right side
    190.12x = 31,714.10
  5. Step 5: Solve for x
    x = 31,714.10/190.12
  6. Step 6: Final answer
    x = 166.81

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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.