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Finding the Fourth Proportional to 220.96, 304.74 and 155.48

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Solution

The fourth proportional to 220.96, 304.74 and 155.48 is: 214.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.96 : 304.74 = 155.48 : x
  2. Step 2: Convert to fraction form
    220.96/304.74 = 155.48/x
  3. Step 3: Cross multiply
    220.96x = 304.74 × 155.48
  4. Step 4: Simplify right side
    220.96x = 47,380.98
  5. Step 5: Solve for x
    x = 47,380.98/220.96
  6. Step 6: Final answer
    x = 214.43

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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.