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Finding the Third Proportional to 210.50 and 281.50

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Solution

The third proportional to 210.50 and 281.50 is: 376.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.50 : 281.50 = 281.50 : x
  2. Step 2: Convert to fraction form
    210.50/281.50 = 281.50/x
  3. Step 3: Cross multiply
    210.50x = 281.50 × 281.50
  4. Step 4: Simplify right side
    210.50x = 79,242.25
  5. Step 5: Solve for x
    x = 79,242.25/210.50
  6. Step 6: Final answer
    x = 376.45

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.