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Finding the Third Proportional to 1,620 and 4,158

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Solution

The third proportional to 1,620 and 4,158 is: 10,672.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620 : 4,158 = 4,158 : x
  2. Step 2: Convert to fraction form
    1,620/4,158 = 4,158/x
  3. Step 3: Cross multiply
    1,620x = 4,158 × 4,158
  4. Step 4: Simplify right side
    1,620x = 17,288,964
  5. Step 5: Solve for x
    x = 17,288,964/1,620
  6. Step 6: Final answer
    x = 10,672.20

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Why These Related Problems?

These problems maintain the same ratio (2.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.