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Finding the Third Proportional to 985.50 and 2,169

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Solution

The third proportional to 985.50 and 2,169 is: 4,773.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.50 : 2,169 = 2,169 : x
  2. Step 2: Convert to fraction form
    985.50/2,169 = 2,169/x
  3. Step 3: Cross multiply
    985.50x = 2,169 × 2,169
  4. Step 4: Simplify right side
    985.50x = 4,704,561
  5. Step 5: Solve for x
    x = 4,704,561/985.50
  6. Step 6: Final answer
    x = 4,773.78

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.