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Finding the Third Proportional to 258,012 and 398,518

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Solution

The third proportional to 258,012 and 398,518 is: 615,539.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,012 : 398,518 = 398,518 : x
  2. Step 2: Convert to fraction form
    258,012/398,518 = 398,518/x
  3. Step 3: Cross multiply
    258,012x = 398,518 × 398,518
  4. Step 4: Simplify right side
    258,012x = 158,816,596,324
  5. Step 5: Solve for x
    x = 158,816,596,324/258,012
  6. Step 6: Final answer
    x = 615,539.57

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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.