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Finding the Fourth Proportional to 817.66, 1,225.78 and 427.44

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Solution

The fourth proportional to 817.66, 1,225.78 and 427.44 is: 640.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.66 : 1,225.78 = 427.44 : x
  2. Step 2: Convert to fraction form
    817.66/1,225.78 = 427.44/x
  3. Step 3: Cross multiply
    817.66x = 1,225.78 × 427.44
  4. Step 4: Simplify right side
    817.66x = 523,947.40
  5. Step 5: Solve for x
    x = 523,947.40/817.66
  6. Step 6: Final answer
    x = 640.79

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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.