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Finding the Fourth Proportional to 21,796.91, 30,079.45 and 12,844.79

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Solution

The fourth proportional to 21,796.91, 30,079.45 and 12,844.79 is: 17,725.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,796.91 : 30,079.45 = 12,844.79 : x
  2. Step 2: Convert to fraction form
    21,796.91/30,079.45 = 12,844.79/x
  3. Step 3: Cross multiply
    21,796.91x = 30,079.45 × 12,844.79
  4. Step 4: Simplify right side
    21,796.91x = 386,364,218.57
  5. Step 5: Solve for x
    x = 386,364,218.57/21,796.91
  6. Step 6: Final answer
    x = 17,725.64

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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.