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Finding the Fourth Proportional to 28,388.58, 42,383.22 and 21,689.97

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Solution

The fourth proportional to 28,388.58, 42,383.22 and 21,689.97 is: 32,382.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,388.58 : 42,383.22 = 21,689.97 : x
  2. Step 2: Convert to fraction form
    28,388.58/42,383.22 = 21,689.97/x
  3. Step 3: Cross multiply
    28,388.58x = 42,383.22 × 21,689.97
  4. Step 4: Simplify right side
    28,388.58x = 919,290,770.30
  5. Step 5: Solve for x
    x = 919,290,770.30/28,388.58
  6. Step 6: Final answer
    x = 32,382.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.