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Finding the Fourth Proportional to 220.67, 304.61 and 137.80

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Solution

The fourth proportional to 220.67, 304.61 and 137.80 is: 190.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.67 : 304.61 = 137.80 : x
  2. Step 2: Convert to fraction form
    220.67/304.61 = 137.80/x
  3. Step 3: Cross multiply
    220.67x = 304.61 × 137.80
  4. Step 4: Simplify right side
    220.67x = 41,973.62
  5. Step 5: Solve for x
    x = 41,973.62/220.67
  6. Step 6: Final answer
    x = 190.21

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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.