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Finding the Fourth Proportional to 81,628.35, 122,489.80 and 34,239.21

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Solution

The fourth proportional to 81,628.35, 122,489.80 and 34,239.21 is: 51,378.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,628.35 : 122,489.80 = 34,239.21 : x
  2. Step 2: Convert to fraction form
    81,628.35/122,489.80 = 34,239.21/x
  3. Step 3: Cross multiply
    81,628.35x = 122,489.80 × 34,239.21
  4. Step 4: Simplify right side
    81,628.35x = 4,193,953,372.61
  5. Step 5: Solve for x
    x = 4,193,953,372.61/81,628.35
  6. Step 6: Final answer
    x = 51,378.64

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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.