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Finding the Third Proportional to 988.31 and 2,142.56

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Solution

The third proportional to 988.31 and 2,142.56 is: 4,644.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.31 : 2,142.56 = 2,142.56 : x
  2. Step 2: Convert to fraction form
    988.31/2,142.56 = 2,142.56/x
  3. Step 3: Cross multiply
    988.31x = 2,142.56 × 2,142.56
  4. Step 4: Simplify right side
    988.31x = 4,590,574.07
  5. Step 5: Solve for x
    x = 4,590,574.07/988.31
  6. Step 6: Final answer
    x = 4,644.86

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.