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Finding the Fourth Proportional to 39,628.34, 54,687.86 and 21,723.22

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Solution

The fourth proportional to 39,628.34, 54,687.86 and 21,723.22 is: 29,978.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,628.34 : 54,687.86 = 21,723.22 : x
  2. Step 2: Convert to fraction form
    39,628.34/54,687.86 = 21,723.22/x
  3. Step 3: Cross multiply
    39,628.34x = 54,687.86 × 21,723.22
  4. Step 4: Simplify right side
    39,628.34x = 1,187,996,414.11
  5. Step 5: Solve for x
    x = 1,187,996,414.11/39,628.34
  6. Step 6: Final answer
    x = 29,978.46

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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.