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Finding the Third Proportional to 311,130 and 678,574

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Solution

The third proportional to 311,130 and 678,574 is: 1,479,968.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    311,130 : 678,574 = 678,574 : x
  2. Step 2: Convert to fraction form
    311,130/678,574 = 678,574/x
  3. Step 3: Cross multiply
    311,130x = 678,574 × 678,574
  4. Step 4: Simplify right side
    311,130x = 460,462,673,476
  5. Step 5: Solve for x
    x = 460,462,673,476/311,130
  6. Step 6: Final answer
    x = 1,479,968.74

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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.