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Finding the Third Proportional to 139,148 and 211,378

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Solution

The third proportional to 139,148 and 211,378 is: 321,101.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,148 : 211,378 = 211,378 : x
  2. Step 2: Convert to fraction form
    139,148/211,378 = 211,378/x
  3. Step 3: Cross multiply
    139,148x = 211,378 × 211,378
  4. Step 4: Simplify right side
    139,148x = 44,680,658,884
  5. Step 5: Solve for x
    x = 44,680,658,884/139,148
  6. Step 6: Final answer
    x = 321,101.70

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.