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Finding the Fourth Proportional to 498.85, 688.10 and 321.76

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Solution

The fourth proportional to 498.85, 688.10 and 321.76 is: 443.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.85 : 688.10 = 321.76 : x
  2. Step 2: Convert to fraction form
    498.85/688.10 = 321.76/x
  3. Step 3: Cross multiply
    498.85x = 688.10 × 321.76
  4. Step 4: Simplify right side
    498.85x = 221,399.62
  5. Step 5: Solve for x
    x = 221,399.62/498.85
  6. Step 6: Final answer
    x = 443.82

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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.