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Finding the Third Proportional to 211.50 and 390.94

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Solution

The third proportional to 211.50 and 390.94 is: 722.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.50 : 390.94 = 390.94 : x
  2. Step 2: Convert to fraction form
    211.50/390.94 = 390.94/x
  3. Step 3: Cross multiply
    211.50x = 390.94 × 390.94
  4. Step 4: Simplify right side
    211.50x = 152,832.13
  5. Step 5: Solve for x
    x = 152,832.13/211.50
  6. Step 6: Final answer
    x = 722.61

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Why These Related Problems?

These problems maintain the same ratio (1.85) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.