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Finding the Third Proportional to 258,672 and 399,080

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Solution

The third proportional to 258,672 and 399,080 is: 615,701.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,672 : 399,080 = 399,080 : x
  2. Step 2: Convert to fraction form
    258,672/399,080 = 399,080/x
  3. Step 3: Cross multiply
    258,672x = 399,080 × 399,080
  4. Step 4: Simplify right side
    258,672x = 159,264,846,400
  5. Step 5: Solve for x
    x = 159,264,846,400/258,672
  6. Step 6: Final answer
    x = 615,701.92

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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.