Home / 15,709.31-21,679.26-8,635.91

Finding the Fourth Proportional to 15,709.31, 21,679.26 and 8,635.91

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Solution

The fourth proportional to 15,709.31, 21,679.26 and 8,635.91 is: 11,917.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,709.31 : 21,679.26 = 8,635.91 : x
  2. Step 2: Convert to fraction form
    15,709.31/21,679.26 = 8,635.91/x
  3. Step 3: Cross multiply
    15,709.31x = 21,679.26 × 8,635.91
  4. Step 4: Simplify right side
    15,709.31x = 187,220,138.23
  5. Step 5: Solve for x
    x = 187,220,138.23/15,709.31
  6. Step 6: Final answer
    x = 11,917.78

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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.