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Finding the Fourth Proportional to 21,687.89, 29,931.23 and 13,627.13

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Solution

The fourth proportional to 21,687.89, 29,931.23 and 13,627.13 is: 18,806.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,687.89 : 29,931.23 = 13,627.13 : x
  2. Step 2: Convert to fraction form
    21,687.89/29,931.23 = 13,627.13/x
  3. Step 3: Cross multiply
    21,687.89x = 29,931.23 × 13,627.13
  4. Step 4: Simplify right side
    21,687.89x = 407,876,768.96
  5. Step 5: Solve for x
    x = 407,876,768.96/21,687.89
  6. Step 6: Final answer
    x = 18,806.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.