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Finding the Fourth Proportional to 495.89, 684.20 and 321.13

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Solution

The fourth proportional to 495.89, 684.20 and 321.13 is: 443.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    495.89 : 684.20 = 321.13 : x
  2. Step 2: Convert to fraction form
    495.89/684.20 = 321.13/x
  3. Step 3: Cross multiply
    495.89x = 684.20 × 321.13
  4. Step 4: Simplify right side
    495.89x = 219,712.12
  5. Step 5: Solve for x
    x = 219,712.12/495.89
  6. Step 6: Final answer
    x = 443.07

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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.