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Finding the Third Proportional to 280,122 and 420,382

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Solution

The third proportional to 280,122 and 420,382 is: 630,871.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,122 : 420,382 = 420,382 : x
  2. Step 2: Convert to fraction form
    280,122/420,382 = 420,382/x
  3. Step 3: Cross multiply
    280,122x = 420,382 × 420,382
  4. Step 4: Simplify right side
    280,122x = 176,721,025,924
  5. Step 5: Solve for x
    x = 176,721,025,924/280,122
  6. Step 6: Final answer
    x = 630,871.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.