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Finding the Fourth Proportional to 146.51, 202.21 and 121.90

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Solution

The fourth proportional to 146.51, 202.21 and 121.90 is: 168.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.51 : 202.21 = 121.90 : x
  2. Step 2: Convert to fraction form
    146.51/202.21 = 121.90/x
  3. Step 3: Cross multiply
    146.51x = 202.21 × 121.90
  4. Step 4: Simplify right side
    146.51x = 24,649.35
  5. Step 5: Solve for x
    x = 24,649.35/146.51
  6. Step 6: Final answer
    x = 168.25

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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.