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Finding the Fourth Proportional to 327.98, 491.66 and 145.40

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Solution

The fourth proportional to 327.98, 491.66 and 145.40 is: 217.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.98 : 491.66 = 145.40 : x
  2. Step 2: Convert to fraction form
    327.98/491.66 = 145.40/x
  3. Step 3: Cross multiply
    327.98x = 491.66 × 145.40
  4. Step 4: Simplify right side
    327.98x = 71,487.36
  5. Step 5: Solve for x
    x = 71,487.36/327.98
  6. Step 6: Final answer
    x = 217.96

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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.