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Finding the Fourth Proportional to 21,251.86, 29,310.12 and 18,863.58

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Solution

The fourth proportional to 21,251.86, 29,310.12 and 18,863.58 is: 26,016.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,251.86 : 29,310.12 = 18,863.58 : x
  2. Step 2: Convert to fraction form
    21,251.86/29,310.12 = 18,863.58/x
  3. Step 3: Cross multiply
    21,251.86x = 29,310.12 × 18,863.58
  4. Step 4: Simplify right side
    21,251.86x = 552,893,793.43
  5. Step 5: Solve for x
    x = 552,893,793.43/21,251.86
  6. Step 6: Final answer
    x = 26,016.25

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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.