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Finding the Fourth Proportional to 1,274.78, 1,911.99 and 408.98

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Solution

The fourth proportional to 1,274.78, 1,911.99 and 408.98 is: 613.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.78 : 1,911.99 = 408.98 : x
  2. Step 2: Convert to fraction form
    1,274.78/1,911.99 = 408.98/x
  3. Step 3: Cross multiply
    1,274.78x = 1,911.99 × 408.98
  4. Step 4: Simplify right side
    1,274.78x = 781,971.98
  5. Step 5: Solve for x
    x = 781,971.98/1,274.78
  6. Step 6: Final answer
    x = 613.42

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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.