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Finding the Fourth Proportional to 220.32, 303.93 and 131.78

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Solution

The fourth proportional to 220.32, 303.93 and 131.78 is: 181.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.32 : 303.93 = 131.78 : x
  2. Step 2: Convert to fraction form
    220.32/303.93 = 131.78/x
  3. Step 3: Cross multiply
    220.32x = 303.93 × 131.78
  4. Step 4: Simplify right side
    220.32x = 40,052.66
  5. Step 5: Solve for x
    x = 40,052.66/220.32
  6. Step 6: Final answer
    x = 181.79

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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.