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Finding the Fourth Proportional to 748.69, 1,123.26 and 286.48

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Solution

The fourth proportional to 748.69, 1,123.26 and 286.48 is: 429.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.69 : 1,123.26 = 286.48 : x
  2. Step 2: Convert to fraction form
    748.69/1,123.26 = 286.48/x
  3. Step 3: Cross multiply
    748.69x = 1,123.26 × 286.48
  4. Step 4: Simplify right side
    748.69x = 321,791.52
  5. Step 5: Solve for x
    x = 321,791.52/748.69
  6. Step 6: Final answer
    x = 429.81

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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.