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Finding the Fourth Proportional to 812.76, 1,218.63 and 325.26

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Solution

The fourth proportional to 812.76, 1,218.63 and 325.26 is: 487.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.76 : 1,218.63 = 325.26 : x
  2. Step 2: Convert to fraction form
    812.76/1,218.63 = 325.26/x
  3. Step 3: Cross multiply
    812.76x = 1,218.63 × 325.26
  4. Step 4: Simplify right side
    812.76x = 396,371.59
  5. Step 5: Solve for x
    x = 396,371.59/812.76
  6. Step 6: Final answer
    x = 487.69

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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.