Home / 21,896.89-30,218.31-13,398.86

Finding the Fourth Proportional to 21,896.89, 30,218.31 and 13,398.86

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Solution

The fourth proportional to 21,896.89, 30,218.31 and 13,398.86 is: 18,490.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,896.89 : 30,218.31 = 13,398.86 : x
  2. Step 2: Convert to fraction form
    21,896.89/30,218.31 = 13,398.86/x
  3. Step 3: Cross multiply
    21,896.89x = 30,218.31 × 13,398.86
  4. Step 4: Simplify right side
    21,896.89x = 404,890,687.04
  5. Step 5: Solve for x
    x = 404,890,687.04/21,896.89
  6. Step 6: Final answer
    x = 18,490.79

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1.5x scale

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.