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Finding the Third Proportional to 210,120 and 315,395

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Solution

The third proportional to 210,120 and 315,395 is: 473,415.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,120 : 315,395 = 315,395 : x
  2. Step 2: Convert to fraction form
    210,120/315,395 = 315,395/x
  3. Step 3: Cross multiply
    210,120x = 315,395 × 315,395
  4. Step 4: Simplify right side
    210,120x = 99,474,006,025
  5. Step 5: Solve for x
    x = 99,474,006,025/210,120
  6. Step 6: Final answer
    x = 473,415.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.