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Finding the Fourth Proportional to 327.40, 491.19 and 259.15

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Solution

The fourth proportional to 327.40, 491.19 and 259.15 is: 388.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.40 : 491.19 = 259.15 : x
  2. Step 2: Convert to fraction form
    327.40/491.19 = 259.15/x
  3. Step 3: Cross multiply
    327.40x = 491.19 × 259.15
  4. Step 4: Simplify right side
    327.40x = 127,291.89
  5. Step 5: Solve for x
    x = 127,291.89/327.40
  6. Step 6: Final answer
    x = 388.80

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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.