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Finding the Third Proportional to 626.25 and 989.63

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Solution

The third proportional to 626.25 and 989.63 is: 1,563.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.25 : 989.63 = 989.63 : x
  2. Step 2: Convert to fraction form
    626.25/989.63 = 989.63/x
  3. Step 3: Cross multiply
    626.25x = 989.63 × 989.63
  4. Step 4: Simplify right side
    626.25x = 979,357.64
  5. Step 5: Solve for x
    x = 979,357.64/626.25
  6. Step 6: Final answer
    x = 1,563.84

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.