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Finding the Fourth Proportional to 495.88, 684.22 and 321.20

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Solution

The fourth proportional to 495.88, 684.22 and 321.20 is: 443.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    495.88 : 684.22 = 321.20 : x
  2. Step 2: Convert to fraction form
    495.88/684.22 = 321.20/x
  3. Step 3: Cross multiply
    495.88x = 684.22 × 321.20
  4. Step 4: Simplify right side
    495.88x = 219,771.46
  5. Step 5: Solve for x
    x = 219,771.46/495.88
  6. Step 6: Final answer
    x = 443.19

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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.