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Finding the Fourth Proportional to 2,278.63, 3,415.90 and 817.44

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Solution

The fourth proportional to 2,278.63, 3,415.90 and 817.44 is: 1,225.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,278.63 : 3,415.90 = 817.44 : x
  2. Step 2: Convert to fraction form
    2,278.63/3,415.90 = 817.44/x
  3. Step 3: Cross multiply
    2,278.63x = 3,415.90 × 817.44
  4. Step 4: Simplify right side
    2,278.63x = 2,792,289.21
  5. Step 5: Solve for x
    x = 2,792,289.21/2,278.63
  6. Step 6: Final answer
    x = 1,225.42

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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.