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Finding the Third Proportional to 390.50 and 498

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Solution

The third proportional to 390.50 and 498 is: 635.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.50 : 498 = 498 : x
  2. Step 2: Convert to fraction form
    390.50/498 = 498/x
  3. Step 3: Cross multiply
    390.50x = 498 × 498
  4. Step 4: Simplify right side
    390.50x = 248,004
  5. Step 5: Solve for x
    x = 248,004/390.50
  6. Step 6: Final answer
    x = 635.09

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These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.