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Finding the Third Proportional to 987.56 and 2,181

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Solution

The third proportional to 987.56 and 2,181 is: 4,816.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.56 : 2,181 = 2,181 : x
  2. Step 2: Convert to fraction form
    987.56/2,181 = 2,181/x
  3. Step 3: Cross multiply
    987.56x = 2,181 × 2,181
  4. Step 4: Simplify right side
    987.56x = 4,756,761
  5. Step 5: Solve for x
    x = 4,756,761/987.56
  6. Step 6: Final answer
    x = 4,816.67

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Why These Related Problems?

These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.