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Finding the Third Proportional to 78,612 and 174,639

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Solution

The third proportional to 78,612 and 174,639 is: 387,965.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,612 : 174,639 = 174,639 : x
  2. Step 2: Convert to fraction form
    78,612/174,639 = 174,639/x
  3. Step 3: Cross multiply
    78,612x = 174,639 × 174,639
  4. Step 4: Simplify right side
    78,612x = 30,498,780,321
  5. Step 5: Solve for x
    x = 30,498,780,321/78,612
  6. Step 6: Final answer
    x = 387,965.96

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Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.