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Finding the Third Proportional to 280,740 and 431,953

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Solution

The third proportional to 280,740 and 431,953 is: 664,612.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,740 : 431,953 = 431,953 : x
  2. Step 2: Convert to fraction form
    280,740/431,953 = 431,953/x
  3. Step 3: Cross multiply
    280,740x = 431,953 × 431,953
  4. Step 4: Simplify right side
    280,740x = 186,583,394,209
  5. Step 5: Solve for x
    x = 186,583,394,209/280,740
  6. Step 6: Final answer
    x = 664,612.79

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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.