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Finding the Fourth Proportional to 220.21, 303.71 and 137.25

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Solution

The fourth proportional to 220.21, 303.71 and 137.25 is: 189.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.21 : 303.71 = 137.25 : x
  2. Step 2: Convert to fraction form
    220.21/303.71 = 137.25/x
  3. Step 3: Cross multiply
    220.21x = 303.71 × 137.25
  4. Step 4: Simplify right side
    220.21x = 41,684.20
  5. Step 5: Solve for x
    x = 41,684.20/220.21
  6. Step 6: Final answer
    x = 189.29

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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.