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Finding the Third Proportional to 318.75 and 698.63

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Solution

The third proportional to 318.75 and 698.63 is: 1,531.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.75 : 698.63 = 698.63 : x
  2. Step 2: Convert to fraction form
    318.75/698.63 = 698.63/x
  3. Step 3: Cross multiply
    318.75x = 698.63 × 698.63
  4. Step 4: Simplify right side
    318.75x = 488,076.89
  5. Step 5: Solve for x
    x = 488,076.89/318.75
  6. Step 6: Final answer
    x = 1,531.22

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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.