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Finding the Third Proportional to 1,389 and 3,117

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Solution

The third proportional to 1,389 and 3,117 is: 6,994.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389 : 3,117 = 3,117 : x
  2. Step 2: Convert to fraction form
    1,389/3,117 = 3,117/x
  3. Step 3: Cross multiply
    1,389x = 3,117 × 3,117
  4. Step 4: Simplify right side
    1,389x = 9,715,689
  5. Step 5: Solve for x
    x = 9,715,689/1,389
  6. Step 6: Final answer
    x = 6,994.74

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Why These Related Problems?

These problems maintain the same ratio (2.24) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.