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Finding the Fourth Proportional to 28,821.64, 43,191.90 and 21,701.32

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Solution

The fourth proportional to 28,821.64, 43,191.90 and 21,701.32 is: 32,521.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,821.64 : 43,191.90 = 21,701.32 : x
  2. Step 2: Convert to fraction form
    28,821.64/43,191.90 = 21,701.32/x
  3. Step 3: Cross multiply
    28,821.64x = 43,191.90 × 21,701.32
  4. Step 4: Simplify right side
    28,821.64x = 937,321,243.31
  5. Step 5: Solve for x
    x = 937,321,243.31/28,821.64
  6. Step 6: Final answer
    x = 32,521.44

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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.