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Finding the Fourth Proportional to 669.70, 923.97 and 421.12

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Solution

The fourth proportional to 669.70, 923.97 and 421.12 is: 581.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.70 : 923.97 = 421.12 : x
  2. Step 2: Convert to fraction form
    669.70/923.97 = 421.12/x
  3. Step 3: Cross multiply
    669.70x = 923.97 × 421.12
  4. Step 4: Simplify right side
    669.70x = 389,102.25
  5. Step 5: Solve for x
    x = 389,102.25/669.70
  6. Step 6: Final answer
    x = 581.01

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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.