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Finding the Third Proportional to 921 and 1,639

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Solution

The third proportional to 921 and 1,639 is: 2,916.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    921 : 1,639 = 1,639 : x
  2. Step 2: Convert to fraction form
    921/1,639 = 1,639/x
  3. Step 3: Cross multiply
    921x = 1,639 × 1,639
  4. Step 4: Simplify right side
    921x = 2,686,321
  5. Step 5: Solve for x
    x = 2,686,321/921
  6. Step 6: Final answer
    x = 2,916.74

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Why These Related Problems?

These problems maintain the same ratio (1.78) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.