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Finding the Fourth Proportional to 28,171.97, 38,835.90 and 21,445.88

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Solution

The fourth proportional to 28,171.97, 38,835.90 and 21,445.88 is: 29,563.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,171.97 : 38,835.90 = 21,445.88 : x
  2. Step 2: Convert to fraction form
    28,171.97/38,835.90 = 21,445.88/x
  3. Step 3: Cross multiply
    28,171.97x = 38,835.90 × 21,445.88
  4. Step 4: Simplify right side
    28,171.97x = 832,870,051.09
  5. Step 5: Solve for x
    x = 832,870,051.09/28,171.97
  6. Step 6: Final answer
    x = 29,563.78

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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.