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Finding the Fourth Proportional to 441.05, 660.96 and 420.39

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Solution

The fourth proportional to 441.05, 660.96 and 420.39 is: 630.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    441.05 : 660.96 = 420.39 : x
  2. Step 2: Convert to fraction form
    441.05/660.96 = 420.39/x
  3. Step 3: Cross multiply
    441.05x = 660.96 × 420.39
  4. Step 4: Simplify right side
    441.05x = 277,860.97
  5. Step 5: Solve for x
    x = 277,860.97/441.05
  6. Step 6: Final answer
    x = 630.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.