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Finding the Fourth Proportional to 756.78, 1,044.39 and 495.30

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Solution

The fourth proportional to 756.78, 1,044.39 and 495.30 is: 683.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.78 : 1,044.39 = 495.30 : x
  2. Step 2: Convert to fraction form
    756.78/1,044.39 = 495.30/x
  3. Step 3: Cross multiply
    756.78x = 1,044.39 × 495.30
  4. Step 4: Simplify right side
    756.78x = 517,286.37
  5. Step 5: Solve for x
    x = 517,286.37/756.78
  6. Step 6: Final answer
    x = 683.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.