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Finding the Third Proportional to 687.75 and 1,434

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Solution

The third proportional to 687.75 and 1,434 is: 2,989.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.75 : 1,434 = 1,434 : x
  2. Step 2: Convert to fraction form
    687.75/1,434 = 1,434/x
  3. Step 3: Cross multiply
    687.75x = 1,434 × 1,434
  4. Step 4: Simplify right side
    687.75x = 2,056,356
  5. Step 5: Solve for x
    x = 2,056,356/687.75
  6. Step 6: Final answer
    x = 2,989.98

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Why These Related Problems?

These problems maintain the same ratio (2.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.