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Finding the Fourth Proportional to 818.21, 1,226.43 and 406.53

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Solution

The fourth proportional to 818.21, 1,226.43 and 406.53 is: 609.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.21 : 1,226.43 = 406.53 : x
  2. Step 2: Convert to fraction form
    818.21/1,226.43 = 406.53/x
  3. Step 3: Cross multiply
    818.21x = 1,226.43 × 406.53
  4. Step 4: Simplify right side
    818.21x = 498,580.59
  5. Step 5: Solve for x
    x = 498,580.59/818.21
  6. Step 6: Final answer
    x = 609.36

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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.