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Finding the Third Proportional to 258,008 and 398,508

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Solution

The third proportional to 258,008 and 398,508 is: 615,518.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,008 : 398,508 = 398,508 : x
  2. Step 2: Convert to fraction form
    258,008/398,508 = 398,508/x
  3. Step 3: Cross multiply
    258,008x = 398,508 × 398,508
  4. Step 4: Simplify right side
    258,008x = 158,808,626,064
  5. Step 5: Solve for x
    x = 158,808,626,064/258,008
  6. Step 6: Final answer
    x = 615,518.22

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.