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Finding the Fourth Proportional to 669.11, 923.42 and 389.43

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Solution

The fourth proportional to 669.11, 923.42 and 389.43 is: 537.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.11 : 923.42 = 389.43 : x
  2. Step 2: Convert to fraction form
    669.11/923.42 = 389.43/x
  3. Step 3: Cross multiply
    669.11x = 923.42 × 389.43
  4. Step 4: Simplify right side
    669.11x = 359,600.89
  5. Step 5: Solve for x
    x = 359,600.89/669.11
  6. Step 6: Final answer
    x = 537.43

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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.