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Finding the Fourth Proportional to 817.59, 1,224.82 and 643.34

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Solution

The fourth proportional to 817.59, 1,224.82 and 643.34 is: 963.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.59 : 1,224.82 = 643.34 : x
  2. Step 2: Convert to fraction form
    817.59/1,224.82 = 643.34/x
  3. Step 3: Cross multiply
    817.59x = 1,224.82 × 643.34
  4. Step 4: Simplify right side
    817.59x = 787,979.57
  5. Step 5: Solve for x
    x = 787,979.57/817.59
  6. Step 6: Final answer
    x = 963.78

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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.