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Finding the Fourth Proportional to 816.71, 1,224.98 and 426.55

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Solution

The fourth proportional to 816.71, 1,224.98 and 426.55 is: 639.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.71 : 1,224.98 = 426.55 : x
  2. Step 2: Convert to fraction form
    816.71/1,224.98 = 426.55/x
  3. Step 3: Cross multiply
    816.71x = 1,224.98 × 426.55
  4. Step 4: Simplify right side
    816.71x = 522,514.16
  5. Step 5: Solve for x
    x = 522,514.16/816.71
  6. Step 6: Final answer
    x = 639.78

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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.