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Finding the Fourth Proportional to 486.74, 671.84 and 329.55

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Solution

The fourth proportional to 486.74, 671.84 and 329.55 is: 454.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.74 : 671.84 = 329.55 : x
  2. Step 2: Convert to fraction form
    486.74/671.84 = 329.55/x
  3. Step 3: Cross multiply
    486.74x = 671.84 × 329.55
  4. Step 4: Simplify right side
    486.74x = 221,403.22
  5. Step 5: Solve for x
    x = 221,403.22/486.74
  6. Step 6: Final answer
    x = 454.87

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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.