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Finding the Fourth Proportional to 220.30, 303.78 and 142.66

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Solution

The fourth proportional to 220.30, 303.78 and 142.66 is: 196.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.30 : 303.78 = 142.66 : x
  2. Step 2: Convert to fraction form
    220.30/303.78 = 142.66/x
  3. Step 3: Cross multiply
    220.30x = 303.78 × 142.66
  4. Step 4: Simplify right side
    220.30x = 43,337.25
  5. Step 5: Solve for x
    x = 43,337.25/220.30
  6. Step 6: Final answer
    x = 196.72

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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.