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Finding the Fourth Proportional to 486.45, 671.67 and 329.40

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Solution

The fourth proportional to 486.45, 671.67 and 329.40 is: 454.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.45 : 671.67 = 329.40 : x
  2. Step 2: Convert to fraction form
    486.45/671.67 = 329.40/x
  3. Step 3: Cross multiply
    486.45x = 671.67 × 329.40
  4. Step 4: Simplify right side
    486.45x = 221,248.10
  5. Step 5: Solve for x
    x = 221,248.10/486.45
  6. Step 6: Final answer
    x = 454.82

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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.