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Finding the Fourth Proportional to 146.96, 220 and 121.16

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Solution

The fourth proportional to 146.96, 220 and 121.16 is: 181.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.96 : 220 = 121.16 : x
  2. Step 2: Convert to fraction form
    146.96/220 = 121.16/x
  3. Step 3: Cross multiply
    146.96x = 220 × 121.16
  4. Step 4: Simplify right side
    146.96x = 26,655.20
  5. Step 5: Solve for x
    x = 26,655.20/146.96
  6. Step 6: Final answer
    x = 181.38

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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.