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Finding the Third Proportional to 311,700 and 681,720

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Solution

The third proportional to 311,700 and 681,720 is: 1,490,991.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    311,700 : 681,720 = 681,720 : x
  2. Step 2: Convert to fraction form
    311,700/681,720 = 681,720/x
  3. Step 3: Cross multiply
    311,700x = 681,720 × 681,720
  4. Step 4: Simplify right side
    311,700x = 464,742,158,400
  5. Step 5: Solve for x
    x = 464,742,158,400/311,700
  6. Step 6: Final answer
    x = 1,490,991.85

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.