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Finding the Fourth Proportional to 498.50, 687.58 and 321.51

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Solution

The fourth proportional to 498.50, 687.58 and 321.51 is: 443.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.50 : 687.58 = 321.51 : x
  2. Step 2: Convert to fraction form
    498.50/687.58 = 321.51/x
  3. Step 3: Cross multiply
    498.50x = 687.58 × 321.51
  4. Step 4: Simplify right side
    498.50x = 221,063.85
  5. Step 5: Solve for x
    x = 221,063.85/498.50
  6. Step 6: Final answer
    x = 443.46

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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.