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Finding the Fourth Proportional to 669.10, 923.41 and 389.32

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Solution

The fourth proportional to 669.10, 923.41 and 389.32 is: 537.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.10 : 923.41 = 389.32 : x
  2. Step 2: Convert to fraction form
    669.10/923.41 = 389.32/x
  3. Step 3: Cross multiply
    669.10x = 923.41 × 389.32
  4. Step 4: Simplify right side
    669.10x = 359,497.36
  5. Step 5: Solve for x
    x = 359,497.36/669.10
  6. Step 6: Final answer
    x = 537.29

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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.