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Finding the Third Proportional to 2,121.81 and 4,653.69

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Solution

The third proportional to 2,121.81 and 4,653.69 is: 10,206.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.81 : 4,653.69 = 4,653.69 : x
  2. Step 2: Convert to fraction form
    2,121.81/4,653.69 = 4,653.69/x
  3. Step 3: Cross multiply
    2,121.81x = 4,653.69 × 4,653.69
  4. Step 4: Simplify right side
    2,121.81x = 21,656,807.35
  5. Step 5: Solve for x
    x = 21,656,807.35/2,121.81
  6. Step 6: Final answer
    x = 10,206.75

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.