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Finding the Fourth Proportional to 327.64, 491.64 and 135.40

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Solution

The fourth proportional to 327.64, 491.64 and 135.40 is: 203.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.64 : 491.64 = 135.40 : x
  2. Step 2: Convert to fraction form
    327.64/491.64 = 135.40/x
  3. Step 3: Cross multiply
    327.64x = 491.64 × 135.40
  4. Step 4: Simplify right side
    327.64x = 66,568.06
  5. Step 5: Solve for x
    x = 66,568.06/327.64
  6. Step 6: Final answer
    x = 203.17

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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.