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Finding the Fourth Proportional to 21,479.86, 29,642.16 and 11,921.21

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Solution

The fourth proportional to 21,479.86, 29,642.16 and 11,921.21 is: 16,451.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,479.86 : 29,642.16 = 11,921.21 : x
  2. Step 2: Convert to fraction form
    21,479.86/29,642.16 = 11,921.21/x
  3. Step 3: Cross multiply
    21,479.86x = 29,642.16 × 11,921.21
  4. Step 4: Simplify right side
    21,479.86x = 353,370,414.21
  5. Step 5: Solve for x
    x = 353,370,414.21/21,479.86
  6. Step 6: Final answer
    x = 16,451.25

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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.