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Finding the Third Proportional to 315 and 690.84

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Solution

The third proportional to 315 and 690.84 is: 1,515.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    315 : 690.84 = 690.84 : x
  2. Step 2: Convert to fraction form
    315/690.84 = 690.84/x
  3. Step 3: Cross multiply
    315x = 690.84 × 690.84
  4. Step 4: Simplify right side
    315x = 477,265.09
  5. Step 5: Solve for x
    x = 477,265.09/315
  6. Step 6: Final answer
    x = 1,515.13

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.