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Finding the Third Proportional to 989 and 2,130

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Solution

The third proportional to 989 and 2,130 is: 4,587.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    989 : 2,130 = 2,130 : x
  2. Step 2: Convert to fraction form
    989/2,130 = 2,130/x
  3. Step 3: Cross multiply
    989x = 2,130 × 2,130
  4. Step 4: Simplify right side
    989x = 4,536,900
  5. Step 5: Solve for x
    x = 4,536,900/989
  6. Step 6: Final answer
    x = 4,587.36

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.