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Finding the Third Proportional to 2,958 and 4,640

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Solution

The third proportional to 2,958 and 4,640 is: 7,278.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,958 : 4,640 = 4,640 : x
  2. Step 2: Convert to fraction form
    2,958/4,640 = 4,640/x
  3. Step 3: Cross multiply
    2,958x = 4,640 × 4,640
  4. Step 4: Simplify right side
    2,958x = 21,529,600
  5. Step 5: Solve for x
    x = 21,529,600/2,958
  6. Step 6: Final answer
    x = 7,278.43

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.