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Finding the Fourth Proportional to 190, 262.20 and 121

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Solution

The fourth proportional to 190, 262.20 and 121 is: 166.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    190 : 262.20 = 121 : x
  2. Step 2: Convert to fraction form
    190/262.20 = 121/x
  3. Step 3: Cross multiply
    190x = 262.20 × 121
  4. Step 4: Simplify right side
    190x = 31,726.20
  5. Step 5: Solve for x
    x = 31,726.20/190
  6. Step 6: Final answer
    x = 166.98

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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.