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Finding the Third Proportional to 145,209 and 312,669

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Solution

The third proportional to 145,209 and 312,669 is: 673,249.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,209 : 312,669 = 312,669 : x
  2. Step 2: Convert to fraction form
    145,209/312,669 = 312,669/x
  3. Step 3: Cross multiply
    145,209x = 312,669 × 312,669
  4. Step 4: Simplify right side
    145,209x = 97,761,903,561
  5. Step 5: Solve for x
    x = 97,761,903,561/145,209
  6. Step 6: Final answer
    x = 673,249.62

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.