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Finding the Fourth Proportional to 486.73, 672.18 and 321.07

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Solution

The fourth proportional to 486.73, 672.18 and 321.07 is: 443.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.73 : 672.18 = 321.07 : x
  2. Step 2: Convert to fraction form
    486.73/672.18 = 321.07/x
  3. Step 3: Cross multiply
    486.73x = 672.18 × 321.07
  4. Step 4: Simplify right side
    486.73x = 215,816.83
  5. Step 5: Solve for x
    x = 215,816.83/486.73
  6. Step 6: Final answer
    x = 443.40

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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.