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Finding the Fourth Proportional to 748.99, 1,123.37 and 286.79

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Solution

The fourth proportional to 748.99, 1,123.37 and 286.79 is: 430.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.99 : 1,123.37 = 286.79 : x
  2. Step 2: Convert to fraction form
    748.99/1,123.37 = 286.79/x
  3. Step 3: Cross multiply
    748.99x = 1,123.37 × 286.79
  4. Step 4: Simplify right side
    748.99x = 322,169.85
  5. Step 5: Solve for x
    x = 322,169.85/748.99
  6. Step 6: Final answer
    x = 430.14

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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.