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Finding the Fourth Proportional to 748.97, 1,123.27 and 286.78

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Solution

The fourth proportional to 748.97, 1,123.27 and 286.78 is: 430.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.97 : 1,123.27 = 286.78 : x
  2. Step 2: Convert to fraction form
    748.97/1,123.27 = 286.78/x
  3. Step 3: Cross multiply
    748.97x = 1,123.27 × 286.78
  4. Step 4: Simplify right side
    748.97x = 322,128.37
  5. Step 5: Solve for x
    x = 322,128.37/748.97
  6. Step 6: Final answer
    x = 430.09

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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.