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Finding the Third Proportional to 428.50 and 490

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Solution

The third proportional to 428.50 and 490 is: 560.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.50 : 490 = 490 : x
  2. Step 2: Convert to fraction form
    428.50/490 = 490/x
  3. Step 3: Cross multiply
    428.50x = 490 × 490
  4. Step 4: Simplify right side
    428.50x = 240,100
  5. Step 5: Solve for x
    x = 240,100/428.50
  6. Step 6: Final answer
    x = 560.33

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These problems maintain the same ratio (1.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.