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Finding the Third Proportional to 399.50 and 442

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Solution

The third proportional to 399.50 and 442 is: 489.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.50 : 442 = 442 : x
  2. Step 2: Convert to fraction form
    399.50/442 = 442/x
  3. Step 3: Cross multiply
    399.50x = 442 × 442
  4. Step 4: Simplify right side
    399.50x = 195,364
  5. Step 5: Solve for x
    x = 195,364/399.50
  6. Step 6: Final answer
    x = 489.02

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These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.