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Finding the Third Proportional to 989 and 2,139

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Solution

The third proportional to 989 and 2,139 is: 4,626.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    989 : 2,139 = 2,139 : x
  2. Step 2: Convert to fraction form
    989/2,139 = 2,139/x
  3. Step 3: Cross multiply
    989x = 2,139 × 2,139
  4. Step 4: Simplify right side
    989x = 4,575,321
  5. Step 5: Solve for x
    x = 4,575,321/989
  6. Step 6: Final answer
    x = 4,626.21

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.