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Finding the Third Proportional to 689.63 and 1,455.75

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Solution

The third proportional to 689.63 and 1,455.75 is: 3,072.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.63 : 1,455.75 = 1,455.75 : x
  2. Step 2: Convert to fraction form
    689.63/1,455.75 = 1,455.75/x
  3. Step 3: Cross multiply
    689.63x = 1,455.75 × 1,455.75
  4. Step 4: Simplify right side
    689.63x = 2,119,208.06
  5. Step 5: Solve for x
    x = 2,119,208.06/689.63
  6. Step 6: Final answer
    x = 3,072.99

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.