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Finding the Fourth Proportional to 441.90, 662.31 and 319.86

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Solution

The fourth proportional to 441.90, 662.31 and 319.86 is: 479.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    441.90 : 662.31 = 319.86 : x
  2. Step 2: Convert to fraction form
    441.90/662.31 = 319.86/x
  3. Step 3: Cross multiply
    441.90x = 662.31 × 319.86
  4. Step 4: Simplify right side
    441.90x = 211,846.48
  5. Step 5: Solve for x
    x = 211,846.48/441.90
  6. Step 6: Final answer
    x = 479.40

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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.