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Finding the Third Proportional to 113.50 and 210.25

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Solution

The third proportional to 113.50 and 210.25 is: 389.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.50 : 210.25 = 210.25 : x
  2. Step 2: Convert to fraction form
    113.50/210.25 = 210.25/x
  3. Step 3: Cross multiply
    113.50x = 210.25 × 210.25
  4. Step 4: Simplify right side
    113.50x = 44,205.06
  5. Step 5: Solve for x
    x = 44,205.06/113.50
  6. Step 6: Final answer
    x = 389.47

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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.