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Finding the Fourth Proportional to 812.79, 1,218.58 and 325.58

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Solution

The fourth proportional to 812.79, 1,218.58 and 325.58 is: 488.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.79 : 1,218.58 = 325.58 : x
  2. Step 2: Convert to fraction form
    812.79/1,218.58 = 325.58/x
  3. Step 3: Cross multiply
    812.79x = 1,218.58 × 325.58
  4. Step 4: Simplify right side
    812.79x = 396,738.37
  5. Step 5: Solve for x
    x = 396,738.37/812.79
  6. Step 6: Final answer
    x = 488.12

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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.