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Finding the Fourth Proportional to 486.17, 671 and 289.64

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Solution

The fourth proportional to 486.17, 671 and 289.64 is: 399.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.17 : 671 = 289.64 : x
  2. Step 2: Convert to fraction form
    486.17/671 = 289.64/x
  3. Step 3: Cross multiply
    486.17x = 671 × 289.64
  4. Step 4: Simplify right side
    486.17x = 194,348.44
  5. Step 5: Solve for x
    x = 194,348.44/486.17
  6. Step 6: Final answer
    x = 399.75

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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.