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Finding the Fourth Proportional to 327.12, 490.20 and 291.12

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Solution

The fourth proportional to 327.12, 490.20 and 291.12 is: 436.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.12 : 490.20 = 291.12 : x
  2. Step 2: Convert to fraction form
    327.12/490.20 = 291.12/x
  3. Step 3: Cross multiply
    327.12x = 490.20 × 291.12
  4. Step 4: Simplify right side
    327.12x = 142,707.02
  5. Step 5: Solve for x
    x = 142,707.02/327.12
  6. Step 6: Final answer
    x = 436.25

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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.