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Finding the Third Proportional to 239,628 and 317,970

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Solution

The third proportional to 239,628 and 317,970 is: 421,924.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    239,628 : 317,970 = 317,970 : x
  2. Step 2: Convert to fraction form
    239,628/317,970 = 317,970/x
  3. Step 3: Cross multiply
    239,628x = 317,970 × 317,970
  4. Step 4: Simplify right side
    239,628x = 101,104,920,900
  5. Step 5: Solve for x
    x = 101,104,920,900/239,628
  6. Step 6: Final answer
    x = 421,924.49

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.