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Finding the Fourth Proportional to 327.68, 491.74 and 259.64

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Solution

The fourth proportional to 327.68, 491.74 and 259.64 is: 389.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.68 : 491.74 = 259.64 : x
  2. Step 2: Convert to fraction form
    327.68/491.74 = 259.64/x
  3. Step 3: Cross multiply
    327.68x = 491.74 × 259.64
  4. Step 4: Simplify right side
    327.68x = 127,674.11
  5. Step 5: Solve for x
    x = 127,674.11/327.68
  6. Step 6: Final answer
    x = 389.63

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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.