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Finding the Third Proportional to 316,720 and 689,210

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Solution

The third proportional to 316,720 and 689,210 is: 1,499,780.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    316,720 : 689,210 = 689,210 : x
  2. Step 2: Convert to fraction form
    316,720/689,210 = 689,210/x
  3. Step 3: Cross multiply
    316,720x = 689,210 × 689,210
  4. Step 4: Simplify right side
    316,720x = 475,010,424,100
  5. Step 5: Solve for x
    x = 475,010,424,100/316,720
  6. Step 6: Final answer
    x = 1,499,780.32

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.