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Finding the Fourth Proportional to 669.56, 923.91 and 389.85

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Solution

The fourth proportional to 669.56, 923.91 and 389.85 is: 537.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.56 : 923.91 = 389.85 : x
  2. Step 2: Convert to fraction form
    669.56/923.91 = 389.85/x
  3. Step 3: Cross multiply
    669.56x = 923.91 × 389.85
  4. Step 4: Simplify right side
    669.56x = 360,186.31
  5. Step 5: Solve for x
    x = 360,186.31/669.56
  6. Step 6: Final answer
    x = 537.95

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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.