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Finding the Fourth Proportional to 220.90, 304.92 and 155.44

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Solution

The fourth proportional to 220.90, 304.92 and 155.44 is: 214.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.90 : 304.92 = 155.44 : x
  2. Step 2: Convert to fraction form
    220.90/304.92 = 155.44/x
  3. Step 3: Cross multiply
    220.90x = 304.92 × 155.44
  4. Step 4: Simplify right side
    220.90x = 47,396.76
  5. Step 5: Solve for x
    x = 47,396.76/220.90
  6. Step 6: Final answer
    x = 214.56

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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.