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Finding the Fourth Proportional to 486.41, 671.03 and 289.88

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Solution

The fourth proportional to 486.41, 671.03 and 289.88 is: 399.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.41 : 671.03 = 289.88 : x
  2. Step 2: Convert to fraction form
    486.41/671.03 = 289.88/x
  3. Step 3: Cross multiply
    486.41x = 671.03 × 289.88
  4. Step 4: Simplify right side
    486.41x = 194,516.98
  5. Step 5: Solve for x
    x = 194,516.98/486.41
  6. Step 6: Final answer
    x = 399.91

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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.