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Finding the Fourth Proportional to 485, 669.84 and 329.48

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Solution

The fourth proportional to 485, 669.84 and 329.48 is: 455.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    485 : 669.84 = 329.48 : x
  2. Step 2: Convert to fraction form
    485/669.84 = 329.48/x
  3. Step 3: Cross multiply
    485x = 669.84 × 329.48
  4. Step 4: Simplify right side
    485x = 220,698.88
  5. Step 5: Solve for x
    x = 220,698.88/485
  6. Step 6: Final answer
    x = 455.05

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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.