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Finding the Fourth Proportional to 39,899.52, 55,059.80 and 21,994.52

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Solution

The fourth proportional to 39,899.52, 55,059.80 and 21,994.52 is: 30,351.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,899.52 : 55,059.80 = 21,994.52 : x
  2. Step 2: Convert to fraction form
    39,899.52/55,059.80 = 21,994.52/x
  3. Step 3: Cross multiply
    39,899.52x = 55,059.80 × 21,994.52
  4. Step 4: Simplify right side
    39,899.52x = 1,211,013,487.02
  5. Step 5: Solve for x
    x = 1,211,013,487.02/39,899.52
  6. Step 6: Final answer
    x = 30,351.58

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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.