Home / 21,687.72-29,927.42-13,188.67

Finding the Fourth Proportional to 21,687.72, 29,927.42 and 13,188.67

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Solution

The fourth proportional to 21,687.72, 29,927.42 and 13,188.67 is: 18,199.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,687.72 : 29,927.42 = 13,188.67 : x
  2. Step 2: Convert to fraction form
    21,687.72/29,927.42 = 13,188.67/x
  3. Step 3: Cross multiply
    21,687.72x = 29,927.42 × 13,188.67
  4. Step 4: Simplify right side
    21,687.72x = 394,702,866.33
  5. Step 5: Solve for x
    x = 394,702,866.33/21,687.72
  6. Step 6: Final answer
    x = 18,199.37

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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.