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Finding the Fourth Proportional to 31,772.70, 43,827.30 and 21,017.88

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Solution

The fourth proportional to 31,772.70, 43,827.30 and 21,017.88 is: 28,992.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,772.70 : 43,827.30 = 21,017.88 : x
  2. Step 2: Convert to fraction form
    31,772.70/43,827.30 = 21,017.88/x
  3. Step 3: Cross multiply
    31,772.70x = 43,827.30 × 21,017.88
  4. Step 4: Simplify right side
    31,772.70x = 921,156,932.12
  5. Step 5: Solve for x
    x = 921,156,932.12/31,772.70
  6. Step 6: Final answer
    x = 28,992.09

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.