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Finding the Fourth Proportional to 220.72, 304.64 and 143.12

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Solution

The fourth proportional to 220.72, 304.64 and 143.12 is: 197.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.72 : 304.64 = 143.12 : x
  2. Step 2: Convert to fraction form
    220.72/304.64 = 143.12/x
  3. Step 3: Cross multiply
    220.72x = 304.64 × 143.12
  4. Step 4: Simplify right side
    220.72x = 43,600.08
  5. Step 5: Solve for x
    x = 43,600.08/220.72
  6. Step 6: Final answer
    x = 197.54

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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.