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Finding the Fourth Proportional to 220.55, 331.33 and 155.70

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Solution

The fourth proportional to 220.55, 331.33 and 155.70 is: 233.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.55 : 331.33 = 155.70 : x
  2. Step 2: Convert to fraction form
    220.55/331.33 = 155.70/x
  3. Step 3: Cross multiply
    220.55x = 331.33 × 155.70
  4. Step 4: Simplify right side
    220.55x = 51,588.08
  5. Step 5: Solve for x
    x = 51,588.08/220.55
  6. Step 6: Final answer
    x = 233.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.