Home / 21,139.90-29,171.93-11,579.30

Finding the Fourth Proportional to 21,139.90, 29,171.93 and 11,579.30

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Solution

The fourth proportional to 21,139.90, 29,171.93 and 11,579.30 is: 15,978.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,139.90 : 29,171.93 = 11,579.30 : x
  2. Step 2: Convert to fraction form
    21,139.90/29,171.93 = 11,579.30/x
  3. Step 3: Cross multiply
    21,139.90x = 29,171.93 × 11,579.30
  4. Step 4: Simplify right side
    21,139.90x = 337,790,450.34
  5. Step 5: Solve for x
    x = 337,790,450.34/21,139.90
  6. Step 6: Final answer
    x = 15,978.81

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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.