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Finding the Third Proportional to 428.63 and 649.13

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Solution

The third proportional to 428.63 and 649.13 is: 983.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.63 : 649.13 = 649.13 : x
  2. Step 2: Convert to fraction form
    428.63/649.13 = 649.13/x
  3. Step 3: Cross multiply
    428.63x = 649.13 × 649.13
  4. Step 4: Simplify right side
    428.63x = 421,363.27
  5. Step 5: Solve for x
    x = 421,363.27/428.63
  6. Step 6: Final answer
    x = 983.06

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.