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Finding the Fourth Proportional to 220.96, 305 and 155.48

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Solution

The fourth proportional to 220.96, 305 and 155.48 is: 214.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.96 : 305 = 155.48 : x
  2. Step 2: Convert to fraction form
    220.96/305 = 155.48/x
  3. Step 3: Cross multiply
    220.96x = 305 × 155.48
  4. Step 4: Simplify right side
    220.96x = 47,421.40
  5. Step 5: Solve for x
    x = 47,421.40/220.96
  6. Step 6: Final answer
    x = 214.62

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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.