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Finding the Third Proportional to 202,818 and 315,288

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Solution

The third proportional to 202,818 and 315,288 is: 490,126.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    202,818 : 315,288 = 315,288 : x
  2. Step 2: Convert to fraction form
    202,818/315,288 = 315,288/x
  3. Step 3: Cross multiply
    202,818x = 315,288 × 315,288
  4. Step 4: Simplify right side
    202,818x = 99,406,522,944
  5. Step 5: Solve for x
    x = 99,406,522,944/202,818
  6. Step 6: Final answer
    x = 490,126.73

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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.