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Finding the Third Proportional to 1,240 and 2,560

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Solution

The third proportional to 1,240 and 2,560 is: 5,285.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240 : 2,560 = 2,560 : x
  2. Step 2: Convert to fraction form
    1,240/2,560 = 2,560/x
  3. Step 3: Cross multiply
    1,240x = 2,560 × 2,560
  4. Step 4: Simplify right side
    1,240x = 6,553,600
  5. Step 5: Solve for x
    x = 6,553,600/1,240
  6. Step 6: Final answer
    x = 5,285.16

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Why These Related Problems?

These problems maintain the same ratio (2.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.