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Finding the Fourth Proportional to 108,379.84, 149,615.31 and 81,532.57

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Solution

The fourth proportional to 108,379.84, 149,615.31 and 81,532.57 is: 112,553.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,379.84 : 149,615.31 = 81,532.57 : x
  2. Step 2: Convert to fraction form
    108,379.84/149,615.31 = 81,532.57/x
  3. Step 3: Cross multiply
    108,379.84x = 149,615.31 × 81,532.57
  4. Step 4: Simplify right side
    108,379.84x = 12,198,520,735.65
  5. Step 5: Solve for x
    x = 12,198,520,735.65/108,379.84
  6. Step 6: Final answer
    x = 112,553.41

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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.