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Finding the Third Proportional to 491.63 and 638.63

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Solution

The third proportional to 491.63 and 638.63 is: 829.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.63 : 638.63 = 638.63 : x
  2. Step 2: Convert to fraction form
    491.63/638.63 = 638.63/x
  3. Step 3: Cross multiply
    491.63x = 638.63 × 638.63
  4. Step 4: Simplify right side
    491.63x = 407,841.89
  5. Step 5: Solve for x
    x = 407,841.89/491.63
  6. Step 6: Final answer
    x = 829.58

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Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.