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Finding the Fourth Proportional to 748.91, 1,123.85 and 286.73

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Solution

The fourth proportional to 748.91, 1,123.85 and 286.73 is: 430.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.91 : 1,123.85 = 286.73 : x
  2. Step 2: Convert to fraction form
    748.91/1,123.85 = 286.73/x
  3. Step 3: Cross multiply
    748.91x = 1,123.85 × 286.73
  4. Step 4: Simplify right side
    748.91x = 322,240.08
  5. Step 5: Solve for x
    x = 322,240.08/748.91
  6. Step 6: Final answer
    x = 430.28

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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.