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Finding the Third Proportional to 356 and 485.25

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Solution

The third proportional to 356 and 485.25 is: 661.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    356 : 485.25 = 485.25 : x
  2. Step 2: Convert to fraction form
    356/485.25 = 485.25/x
  3. Step 3: Cross multiply
    356x = 485.25 × 485.25
  4. Step 4: Simplify right side
    356x = 235,467.56
  5. Step 5: Solve for x
    x = 235,467.56/356
  6. Step 6: Final answer
    x = 661.43

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.