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Finding the Third Proportional to 643,590 and 874,069

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Solution

The third proportional to 643,590 and 874,069 is: 1,187,085.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,590 : 874,069 = 874,069 : x
  2. Step 2: Convert to fraction form
    643,590/874,069 = 874,069/x
  3. Step 3: Cross multiply
    643,590x = 874,069 × 874,069
  4. Step 4: Simplify right side
    643,590x = 763,996,616,761
  5. Step 5: Solve for x
    x = 763,996,616,761/643,590
  6. Step 6: Final answer
    x = 1,187,085.90

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.