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Finding the Third Proportional to 421,973 and 602,990

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Solution

The third proportional to 421,973 and 602,990 is: 861,659.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,973 : 602,990 = 602,990 : x
  2. Step 2: Convert to fraction form
    421,973/602,990 = 602,990/x
  3. Step 3: Cross multiply
    421,973x = 602,990 × 602,990
  4. Step 4: Simplify right side
    421,973x = 363,596,940,100
  5. Step 5: Solve for x
    x = 363,596,940,100/421,973
  6. Step 6: Final answer
    x = 861,659.25

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.