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Finding the Fourth Proportional to 272.40, 375.90 and 161.81

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Solution

The fourth proportional to 272.40, 375.90 and 161.81 is: 223.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.40 : 375.90 = 161.81 : x
  2. Step 2: Convert to fraction form
    272.40/375.90 = 161.81/x
  3. Step 3: Cross multiply
    272.40x = 375.90 × 161.81
  4. Step 4: Simplify right side
    272.40x = 60,824.38
  5. Step 5: Solve for x
    x = 60,824.38/272.40
  6. Step 6: Final answer
    x = 223.29

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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.