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Finding the Third Proportional to 421,288 and 646,010

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Solution

The third proportional to 421,288 and 646,010 is: 990,602.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,288 : 646,010 = 646,010 : x
  2. Step 2: Convert to fraction form
    421,288/646,010 = 646,010/x
  3. Step 3: Cross multiply
    421,288x = 646,010 × 646,010
  4. Step 4: Simplify right side
    421,288x = 417,328,920,100
  5. Step 5: Solve for x
    x = 417,328,920,100/421,288
  6. Step 6: Final answer
    x = 990,602.44

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.