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Finding the Fourth Proportional to 1,274.78, 1,912.98 and 495.38

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Solution

The fourth proportional to 1,274.78, 1,912.98 and 495.38 is: 743.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.78 : 1,912.98 = 495.38 : x
  2. Step 2: Convert to fraction form
    1,274.78/1,912.98 = 495.38/x
  3. Step 3: Cross multiply
    1,274.78x = 1,912.98 × 495.38
  4. Step 4: Simplify right side
    1,274.78x = 947,652.03
  5. Step 5: Solve for x
    x = 947,652.03/1,274.78
  6. Step 6: Final answer
    x = 743.38

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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.