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Finding the Third Proportional to 145,420 and 311,576

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Solution

The third proportional to 145,420 and 311,576 is: 667,580.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,420 : 311,576 = 311,576 : x
  2. Step 2: Convert to fraction form
    145,420/311,576 = 311,576/x
  3. Step 3: Cross multiply
    145,420x = 311,576 × 311,576
  4. Step 4: Simplify right side
    145,420x = 97,079,603,776
  5. Step 5: Solve for x
    x = 97,079,603,776/145,420
  6. Step 6: Final answer
    x = 667,580.83

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.