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Finding the Fourth Proportional to 327.79, 491.85 and 145.31

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Solution

The fourth proportional to 327.79, 491.85 and 145.31 is: 218.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.79 : 491.85 = 145.31 : x
  2. Step 2: Convert to fraction form
    327.79/491.85 = 145.31/x
  3. Step 3: Cross multiply
    327.79x = 491.85 × 145.31
  4. Step 4: Simplify right side
    327.79x = 71,468.26
  5. Step 5: Solve for x
    x = 71,468.26/327.79
  6. Step 6: Final answer
    x = 218.03

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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.