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Finding the Fourth Proportional to 411.87, 618.17 and 290.43

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Solution

The fourth proportional to 411.87, 618.17 and 290.43 is: 435.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.87 : 618.17 = 290.43 : x
  2. Step 2: Convert to fraction form
    411.87/618.17 = 290.43/x
  3. Step 3: Cross multiply
    411.87x = 618.17 × 290.43
  4. Step 4: Simplify right side
    411.87x = 179,533.66
  5. Step 5: Solve for x
    x = 179,533.66/411.87
  6. Step 6: Final answer
    x = 435.90

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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.