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Finding the Third Proportional to 315.75 and 451.13

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Solution

The third proportional to 315.75 and 451.13 is: 644.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.75 : 451.13 = 451.13 : x
  2. Step 2: Convert to fraction form
    315.75/451.13 = 451.13/x
  3. Step 3: Cross multiply
    315.75x = 451.13 × 451.13
  4. Step 4: Simplify right side
    315.75x = 203,513.77
  5. Step 5: Solve for x
    x = 203,513.77/315.75
  6. Step 6: Final answer
    x = 644.54

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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.