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Finding the Fourth Proportional to 486.87, 672.19 and 321.36

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Solution

The fourth proportional to 486.87, 672.19 and 321.36 is: 443.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.87 : 672.19 = 321.36 : x
  2. Step 2: Convert to fraction form
    486.87/672.19 = 321.36/x
  3. Step 3: Cross multiply
    486.87x = 672.19 × 321.36
  4. Step 4: Simplify right side
    486.87x = 216,014.98
  5. Step 5: Solve for x
    x = 216,014.98/486.87
  6. Step 6: Final answer
    x = 443.68

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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.