Home / 21,220.56-31,816.92-11,861.57

Finding the Fourth Proportional to 21,220.56, 31,816.92 and 11,861.57

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Solution

The fourth proportional to 21,220.56, 31,816.92 and 11,861.57 is: 17,784.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,220.56 : 31,816.92 = 11,861.57 : x
  2. Step 2: Convert to fraction form
    21,220.56/31,816.92 = 11,861.57/x
  3. Step 3: Cross multiply
    21,220.56x = 31,816.92 × 11,861.57
  4. Step 4: Simplify right side
    21,220.56x = 377,398,638.97
  5. Step 5: Solve for x
    x = 377,398,638.97/21,220.56
  6. Step 6: Final answer
    x = 17,784.57

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