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Finding the Third Proportional to 316,400 and 687,518

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Solution

The third proportional to 316,400 and 687,518 is: 1,493,934.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    316,400 : 687,518 = 687,518 : x
  2. Step 2: Convert to fraction form
    316,400/687,518 = 687,518/x
  3. Step 3: Cross multiply
    316,400x = 687,518 × 687,518
  4. Step 4: Simplify right side
    316,400x = 472,681,000,324
  5. Step 5: Solve for x
    x = 472,681,000,324/316,400
  6. Step 6: Final answer
    x = 1,493,934.89

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.