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Finding the Fourth Proportional to 220.79, 304.61 and 142.09

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Solution

The fourth proportional to 220.79, 304.61 and 142.09 is: 196.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.79 : 304.61 = 142.09 : x
  2. Step 2: Convert to fraction form
    220.79/304.61 = 142.09/x
  3. Step 3: Cross multiply
    220.79x = 304.61 × 142.09
  4. Step 4: Simplify right side
    220.79x = 43,282.03
  5. Step 5: Solve for x
    x = 43,282.03/220.79
  6. Step 6: Final answer
    x = 196.03

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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.