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Finding the Third Proportional to 647 and 1,240

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Solution

The third proportional to 647 and 1,240 is: 2,376.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    647 : 1,240 = 1,240 : x
  2. Step 2: Convert to fraction form
    647/1,240 = 1,240/x
  3. Step 3: Cross multiply
    647x = 1,240 × 1,240
  4. Step 4: Simplify right side
    647x = 1,537,600
  5. Step 5: Solve for x
    x = 1,537,600/647
  6. Step 6: Final answer
    x = 2,376.51

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Why These Related Problems?

These problems maintain the same ratio (1.92) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.