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Finding the Fourth Proportional to 669.45, 923.91 and 389.73

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Solution

The fourth proportional to 669.45, 923.91 and 389.73 is: 537.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.45 : 923.91 = 389.73 : x
  2. Step 2: Convert to fraction form
    669.45/923.91 = 389.73/x
  3. Step 3: Cross multiply
    669.45x = 923.91 × 389.73
  4. Step 4: Simplify right side
    669.45x = 360,075.44
  5. Step 5: Solve for x
    x = 360,075.44/669.45
  6. Step 6: Final answer
    x = 537.87

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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.