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Finding the Fourth Proportional to 327.69, 491.56 and 142.60

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Solution

The fourth proportional to 327.69, 491.56 and 142.60 is: 213.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.69 : 491.56 = 142.60 : x
  2. Step 2: Convert to fraction form
    327.69/491.56 = 142.60/x
  3. Step 3: Cross multiply
    327.69x = 491.56 × 142.60
  4. Step 4: Simplify right side
    327.69x = 70,096.46
  5. Step 5: Solve for x
    x = 70,096.46/327.69
  6. Step 6: Final answer
    x = 213.91

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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.