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Finding the Third Proportional to 218,728.50 and 312,781.50

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Solution

The third proportional to 218,728.50 and 312,781.50 is: 447,277.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,728.50 : 312,781.50 = 312,781.50 : x
  2. Step 2: Convert to fraction form
    218,728.50/312,781.50 = 312,781.50/x
  3. Step 3: Cross multiply
    218,728.50x = 312,781.50 × 312,781.50
  4. Step 4: Simplify right side
    218,728.50x = 97,832,266,742.25
  5. Step 5: Solve for x
    x = 97,832,266,742.25/218,728.50
  6. Step 6: Final answer
    x = 447,277.18

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.