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Finding the Fourth Proportional to 669.20, 923.46 and 389.42

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Solution

The fourth proportional to 669.20, 923.46 and 389.42 is: 537.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.20 : 923.46 = 389.42 : x
  2. Step 2: Convert to fraction form
    669.20/923.46 = 389.42/x
  3. Step 3: Cross multiply
    669.20x = 923.46 × 389.42
  4. Step 4: Simplify right side
    669.20x = 359,609.18
  5. Step 5: Solve for x
    x = 359,609.18/669.20
  6. Step 6: Final answer
    x = 537.38

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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.