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Finding the Third Proportional to 924 and 1,991

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Solution

The third proportional to 924 and 1,991 is: 4,290.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    924 : 1,991 = 1,991 : x
  2. Step 2: Convert to fraction form
    924/1,991 = 1,991/x
  3. Step 3: Cross multiply
    924x = 1,991 × 1,991
  4. Step 4: Simplify right side
    924x = 3,964,081
  5. Step 5: Solve for x
    x = 3,964,081/924
  6. Step 6: Final answer
    x = 4,290.13

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.