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Finding the Third Proportional to 989 and 2,139.50

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Solution

The third proportional to 989 and 2,139.50 is: 4,628.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    989 : 2,139.50 = 2,139.50 : x
  2. Step 2: Convert to fraction form
    989/2,139.50 = 2,139.50/x
  3. Step 3: Cross multiply
    989x = 2,139.50 × 2,139.50
  4. Step 4: Simplify right side
    989x = 4,577,460.25
  5. Step 5: Solve for x
    x = 4,577,460.25/989
  6. Step 6: Final answer
    x = 4,628.37

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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.