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Finding the Third Proportional to 202,918 and 315,428

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Solution

The third proportional to 202,918 and 315,428 is: 490,320.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    202,918 : 315,428 = 315,428 : x
  2. Step 2: Convert to fraction form
    202,918/315,428 = 315,428/x
  3. Step 3: Cross multiply
    202,918x = 315,428 × 315,428
  4. Step 4: Simplify right side
    202,918x = 99,494,823,184
  5. Step 5: Solve for x
    x = 99,494,823,184/202,918
  6. Step 6: Final answer
    x = 490,320.34

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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.