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Finding the Third Proportional to 218.63 and 505.50

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Solution

The third proportional to 218.63 and 505.50 is: 1,168.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.63 : 505.50 = 505.50 : x
  2. Step 2: Convert to fraction form
    218.63/505.50 = 505.50/x
  3. Step 3: Cross multiply
    218.63x = 505.50 × 505.50
  4. Step 4: Simplify right side
    218.63x = 255,530.25
  5. Step 5: Solve for x
    x = 255,530.25/218.63
  6. Step 6: Final answer
    x = 1,168.81

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Why These Related Problems?

These problems maintain the same ratio (2.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.