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Finding the Third Proportional to 258,056 and 398,748

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Solution

The third proportional to 258,056 and 398,748 is: 616,145.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,056 : 398,748 = 398,748 : x
  2. Step 2: Convert to fraction form
    258,056/398,748 = 398,748/x
  3. Step 3: Cross multiply
    258,056x = 398,748 × 398,748
  4. Step 4: Simplify right side
    258,056x = 158,999,967,504
  5. Step 5: Solve for x
    x = 158,999,967,504/258,056
  6. Step 6: Final answer
    x = 616,145.21

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.