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Finding the Third Proportional to 318.09 and 455.91

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Solution

The third proportional to 318.09 and 455.91 is: 653.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.09 : 455.91 = 455.91 : x
  2. Step 2: Convert to fraction form
    318.09/455.91 = 455.91/x
  3. Step 3: Cross multiply
    318.09x = 455.91 × 455.91
  4. Step 4: Simplify right side
    318.09x = 207,850.51
  5. Step 5: Solve for x
    x = 207,850.51/318.09
  6. Step 6: Final answer
    x = 653.43

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.