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Finding the Fourth Proportional to 816.64, 1,224.28 and 426.88

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Solution

The fourth proportional to 816.64, 1,224.28 and 426.88 is: 639.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.64 : 1,224.28 = 426.88 : x
  2. Step 2: Convert to fraction form
    816.64/1,224.28 = 426.88/x
  3. Step 3: Cross multiply
    816.64x = 1,224.28 × 426.88
  4. Step 4: Simplify right side
    816.64x = 522,620.65
  5. Step 5: Solve for x
    x = 522,620.65/816.64
  6. Step 6: Final answer
    x = 639.96

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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.