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Finding the Third Proportional to 149,278 and 315,403

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Solution

The third proportional to 149,278 and 315,403 is: 666,401.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    149,278 : 315,403 = 315,403 : x
  2. Step 2: Convert to fraction form
    149,278/315,403 = 315,403/x
  3. Step 3: Cross multiply
    149,278x = 315,403 × 315,403
  4. Step 4: Simplify right side
    149,278x = 99,479,052,409
  5. Step 5: Solve for x
    x = 99,479,052,409/149,278
  6. Step 6: Final answer
    x = 666,401.29

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.