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Finding the Third Proportional to 199.86 and 309.45

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Solution

The third proportional to 199.86 and 309.45 is: 479.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.86 : 309.45 = 309.45 : x
  2. Step 2: Convert to fraction form
    199.86/309.45 = 309.45/x
  3. Step 3: Cross multiply
    199.86x = 309.45 × 309.45
  4. Step 4: Simplify right side
    199.86x = 95,756.40
  5. Step 5: Solve for x
    x = 95,756.40/199.86
  6. Step 6: Final answer
    x = 479.11

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.