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Finding the Fourth Proportional to 669.70, 923.61 and 448.42

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Solution

The fourth proportional to 669.70, 923.61 and 448.42 is: 618.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.70 : 923.61 = 448.42 : x
  2. Step 2: Convert to fraction form
    669.70/923.61 = 448.42/x
  3. Step 3: Cross multiply
    669.70x = 923.61 × 448.42
  4. Step 4: Simplify right side
    669.70x = 414,165.20
  5. Step 5: Solve for x
    x = 414,165.20/669.70
  6. Step 6: Final answer
    x = 618.43

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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.