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Finding the Fourth Proportional to 498.43, 687.39 and 321.19

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Solution

The fourth proportional to 498.43, 687.39 and 321.19 is: 442.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.43 : 687.39 = 321.19 : x
  2. Step 2: Convert to fraction form
    498.43/687.39 = 321.19/x
  3. Step 3: Cross multiply
    498.43x = 687.39 × 321.19
  4. Step 4: Simplify right side
    498.43x = 220,782.79
  5. Step 5: Solve for x
    x = 220,782.79/498.43
  6. Step 6: Final answer
    x = 442.96

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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.