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Finding the Fourth Proportional to 21,891.80, 32,845.80 and 7,101.20

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Solution

The fourth proportional to 21,891.80, 32,845.80 and 7,101.20 is: 10,654.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,891.80 : 32,845.80 = 7,101.20 : x
  2. Step 2: Convert to fraction form
    21,891.80/32,845.80 = 7,101.20/x
  3. Step 3: Cross multiply
    21,891.80x = 32,845.80 × 7,101.20
  4. Step 4: Simplify right side
    21,891.80x = 233,244,594.96
  5. Step 5: Solve for x
    x = 233,244,594.96/21,891.80
  6. Step 6: Final answer
    x = 10,654.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.