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Finding the Fourth Proportional to 816.41, 1,224.83 and 426.60

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Solution

The fourth proportional to 816.41, 1,224.83 and 426.60 is: 640.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.41 : 1,224.83 = 426.60 : x
  2. Step 2: Convert to fraction form
    816.41/1,224.83 = 426.60/x
  3. Step 3: Cross multiply
    816.41x = 1,224.83 × 426.60
  4. Step 4: Simplify right side
    816.41x = 522,510.35
  5. Step 5: Solve for x
    x = 522,510.35/816.41
  6. Step 6: Final answer
    x = 640.01

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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.