Home / 21,405.78-29,540.64-11,974.32

Finding the Fourth Proportional to 21,405.78, 29,540.64 and 11,974.32

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Solution

The fourth proportional to 21,405.78, 29,540.64 and 11,974.32 is: 16,524.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,405.78 : 29,540.64 = 11,974.32 : x
  2. Step 2: Convert to fraction form
    21,405.78/29,540.64 = 11,974.32/x
  3. Step 3: Cross multiply
    21,405.78x = 29,540.64 × 11,974.32
  4. Step 4: Simplify right side
    21,405.78x = 353,729,076.36
  5. Step 5: Solve for x
    x = 353,729,076.36/21,405.78
  6. Step 6: Final answer
    x = 16,524.93

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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.