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Finding the Third Proportional to 823 and 1,315.88

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Solution

The third proportional to 823 and 1,315.88 is: 2,103.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    823 : 1,315.88 = 1,315.88 : x
  2. Step 2: Convert to fraction form
    823/1,315.88 = 1,315.88/x
  3. Step 3: Cross multiply
    823x = 1,315.88 × 1,315.88
  4. Step 4: Simplify right side
    823x = 1,731,527.02
  5. Step 5: Solve for x
    x = 1,731,527.02/823
  6. Step 6: Final answer
    x = 2,103.92

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.