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Finding the Third Proportional to 321.75 and 499.50

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Solution

The third proportional to 321.75 and 499.50 is: 775.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.75 : 499.50 = 499.50 : x
  2. Step 2: Convert to fraction form
    321.75/499.50 = 499.50/x
  3. Step 3: Cross multiply
    321.75x = 499.50 × 499.50
  4. Step 4: Simplify right side
    321.75x = 249,500.25
  5. Step 5: Solve for x
    x = 249,500.25/321.75
  6. Step 6: Final answer
    x = 775.45

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.