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Finding the Third Proportional to 178.61 and 391.39

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Solution

The third proportional to 178.61 and 391.39 is: 857.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.61 : 391.39 = 391.39 : x
  2. Step 2: Convert to fraction form
    178.61/391.39 = 391.39/x
  3. Step 3: Cross multiply
    178.61x = 391.39 × 391.39
  4. Step 4: Simplify right side
    178.61x = 153,189.68
  5. Step 5: Solve for x
    x = 153,189.68/178.61
  6. Step 6: Final answer
    x = 857.67

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.