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Finding the Third Proportional to 1,290 and 2,931

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Solution

The third proportional to 1,290 and 2,931 is: 6,659.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290 : 2,931 = 2,931 : x
  2. Step 2: Convert to fraction form
    1,290/2,931 = 2,931/x
  3. Step 3: Cross multiply
    1,290x = 2,931 × 2,931
  4. Step 4: Simplify right side
    1,290x = 8,590,761
  5. Step 5: Solve for x
    x = 8,590,761/1,290
  6. Step 6: Final answer
    x = 6,659.50

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Why These Related Problems?

These problems maintain the same ratio (2.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.