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Finding the Third Proportional to 399,309 and 865,986

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Solution

The third proportional to 399,309 and 865,986 is: 1,878,073.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,309 : 865,986 = 865,986 : x
  2. Step 2: Convert to fraction form
    399,309/865,986 = 865,986/x
  3. Step 3: Cross multiply
    399,309x = 865,986 × 865,986
  4. Step 4: Simplify right side
    399,309x = 749,931,752,196
  5. Step 5: Solve for x
    x = 749,931,752,196/399,309
  6. Step 6: Final answer
    x = 1,878,073.75

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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.