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Finding the Third Proportional to 316,080 and 685,728

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Solution

The third proportional to 316,080 and 685,728 is: 1,487,670.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    316,080 : 685,728 = 685,728 : x
  2. Step 2: Convert to fraction form
    316,080/685,728 = 685,728/x
  3. Step 3: Cross multiply
    316,080x = 685,728 × 685,728
  4. Step 4: Simplify right side
    316,080x = 470,222,889,984
  5. Step 5: Solve for x
    x = 470,222,889,984/316,080
  6. Step 6: Final answer
    x = 1,487,670.49

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.