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Finding the Third Proportional to 425,220 and 657,990

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Solution

The third proportional to 425,220 and 657,990 is: 1,018,180.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,220 : 657,990 = 657,990 : x
  2. Step 2: Convert to fraction form
    425,220/657,990 = 657,990/x
  3. Step 3: Cross multiply
    425,220x = 657,990 × 657,990
  4. Step 4: Simplify right side
    425,220x = 432,950,840,100
  5. Step 5: Solve for x
    x = 432,950,840,100/425,220
  6. Step 6: Final answer
    x = 1,018,180.80

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.