Home / 21,411.20-29,548.32-11,979.20

Finding the Fourth Proportional to 21,411.20, 29,548.32 and 11,979.20

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Solution

The fourth proportional to 21,411.20, 29,548.32 and 11,979.20 is: 16,531.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,411.20 : 29,548.32 = 11,979.20 : x
  2. Step 2: Convert to fraction form
    21,411.20/29,548.32 = 11,979.20/x
  3. Step 3: Cross multiply
    21,411.20x = 29,548.32 × 11,979.20
  4. Step 4: Simplify right side
    21,411.20x = 353,965,234.94
  5. Step 5: Solve for x
    x = 353,965,234.94/21,411.20
  6. Step 6: Final answer
    x = 16,531.78

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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.