Home / 21,285.11-29,360.37-13,221.56

Finding the Fourth Proportional to 21,285.11, 29,360.37 and 13,221.56

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Solution

The fourth proportional to 21,285.11, 29,360.37 and 13,221.56 is: 18,237.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,285.11 : 29,360.37 = 13,221.56 : x
  2. Step 2: Convert to fraction form
    21,285.11/29,360.37 = 13,221.56/x
  3. Step 3: Cross multiply
    21,285.11x = 29,360.37 × 13,221.56
  4. Step 4: Simplify right side
    21,285.11x = 388,190,016.56
  5. Step 5: Solve for x
    x = 388,190,016.56/21,285.11
  6. Step 6: Final answer
    x = 18,237.63

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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.