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Finding the Third Proportional to 426,894 and 643,140

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Solution

The third proportional to 426,894 and 643,140 is: 968,926.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,894 : 643,140 = 643,140 : x
  2. Step 2: Convert to fraction form
    426,894/643,140 = 643,140/x
  3. Step 3: Cross multiply
    426,894x = 643,140 × 643,140
  4. Step 4: Simplify right side
    426,894x = 413,629,059,600
  5. Step 5: Solve for x
    x = 413,629,059,600/426,894
  6. Step 6: Final answer
    x = 968,926.85

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.