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Finding the Third Proportional to 257,818 and 398,394

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Solution

The third proportional to 257,818 and 398,394 is: 615,619.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,818 : 398,394 = 398,394 : x
  2. Step 2: Convert to fraction form
    257,818/398,394 = 398,394/x
  3. Step 3: Cross multiply
    257,818x = 398,394 × 398,394
  4. Step 4: Simplify right side
    257,818x = 158,717,779,236
  5. Step 5: Solve for x
    x = 158,717,779,236/257,818
  6. Step 6: Final answer
    x = 615,619.47

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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.