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Finding the Fourth Proportional to 218,999.80, 327,885.30 and 212,855.80

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Solution

The fourth proportional to 218,999.80, 327,885.30 and 212,855.80 is: 318,686.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,999.80 : 327,885.30 = 212,855.80 : x
  2. Step 2: Convert to fraction form
    218,999.80/327,885.30 = 212,855.80/x
  3. Step 3: Cross multiply
    218,999.80x = 327,885.30 × 212,855.80
  4. Step 4: Simplify right side
    218,999.80x = 69,792,287,839.74
  5. Step 5: Solve for x
    x = 69,792,287,839.74/218,999.80
  6. Step 6: Final answer
    x = 318,686.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.