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Finding the Fourth Proportional to 497.96, 687.24 and 321.11

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Solution

The fourth proportional to 497.96, 687.24 and 321.11 is: 443.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.96 : 687.24 = 321.11 : x
  2. Step 2: Convert to fraction form
    497.96/687.24 = 321.11/x
  3. Step 3: Cross multiply
    497.96x = 687.24 × 321.11
  4. Step 4: Simplify right side
    497.96x = 220,676.20
  5. Step 5: Solve for x
    x = 220,676.20/497.96
  6. Step 6: Final answer
    x = 443.16

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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.