Home / 21,409.79-29,546.30-11,978.42

Finding the Fourth Proportional to 21,409.79, 29,546.30 and 11,978.42

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Solution

The fourth proportional to 21,409.79, 29,546.30 and 11,978.42 is: 16,530.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,409.79 : 29,546.30 = 11,978.42 : x
  2. Step 2: Convert to fraction form
    21,409.79/29,546.30 = 11,978.42/x
  3. Step 3: Cross multiply
    21,409.79x = 29,546.30 × 11,978.42
  4. Step 4: Simplify right side
    21,409.79x = 353,917,873.06
  5. Step 5: Solve for x
    x = 353,917,873.06/21,409.79
  6. Step 6: Final answer
    x = 16,530.66

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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.