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Finding the Fourth Proportional to 21,387.88, 29,513.22 and 11,955.88

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Solution

The fourth proportional to 21,387.88, 29,513.22 and 11,955.88 is: 16,497.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,387.88 : 29,513.22 = 11,955.88 : x
  2. Step 2: Convert to fraction form
    21,387.88/29,513.22 = 11,955.88/x
  3. Step 3: Cross multiply
    21,387.88x = 29,513.22 × 11,955.88
  4. Step 4: Simplify right side
    21,387.88x = 352,856,516.73
  5. Step 5: Solve for x
    x = 352,856,516.73/21,387.88
  6. Step 6: Final answer
    x = 16,497.97

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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.