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Finding the Third Proportional to 1,640 and 2,858

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Solution

The third proportional to 1,640 and 2,858 is: 4,980.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,640 : 2,858 = 2,858 : x
  2. Step 2: Convert to fraction form
    1,640/2,858 = 2,858/x
  3. Step 3: Cross multiply
    1,640x = 2,858 × 2,858
  4. Step 4: Simplify right side
    1,640x = 8,168,164
  5. Step 5: Solve for x
    x = 8,168,164/1,640
  6. Step 6: Final answer
    x = 4,980.59

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Why These Related Problems?

These problems maintain the same ratio (1.74) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.