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Finding the Fourth Proportional to 327.45, 491.38 and 145.00

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Solution

The fourth proportional to 327.45, 491.38 and 145.00 is: 217.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.45 : 491.38 = 145.00 : x
  2. Step 2: Convert to fraction form
    327.45/491.38 = 145.00/x
  3. Step 3: Cross multiply
    327.45x = 491.38 × 145.00
  4. Step 4: Simplify right side
    327.45x = 71,248.51
  5. Step 5: Solve for x
    x = 71,248.51/327.45
  6. Step 6: Final answer
    x = 217.59

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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.