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Finding the Fourth Proportional to 411.43, 618.21 and 309.37

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Solution

The fourth proportional to 411.43, 618.21 and 309.37 is: 464.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.43 : 618.21 = 309.37 : x
  2. Step 2: Convert to fraction form
    411.43/618.21 = 309.37/x
  3. Step 3: Cross multiply
    411.43x = 618.21 × 309.37
  4. Step 4: Simplify right side
    411.43x = 191,255.63
  5. Step 5: Solve for x
    x = 191,255.63/411.43
  6. Step 6: Final answer
    x = 464.86

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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.