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Finding the Third Proportional to 258.19 and 401.63

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Solution

The third proportional to 258.19 and 401.63 is: 624.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.19 : 401.63 = 401.63 : x
  2. Step 2: Convert to fraction form
    258.19/401.63 = 401.63/x
  3. Step 3: Cross multiply
    258.19x = 401.63 × 401.63
  4. Step 4: Simplify right side
    258.19x = 161,302.64
  5. Step 5: Solve for x
    x = 161,302.64/258.19
  6. Step 6: Final answer
    x = 624.75

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.