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Finding the Fourth Proportional to 108,521.80, 162,782.70 and 81,910.60

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Solution

The fourth proportional to 108,521.80, 162,782.70 and 81,910.60 is: 122,865.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,521.80 : 162,782.70 = 81,910.60 : x
  2. Step 2: Convert to fraction form
    108,521.80/162,782.70 = 81,910.60/x
  3. Step 3: Cross multiply
    108,521.80x = 162,782.70 × 81,910.60
  4. Step 4: Simplify right side
    108,521.80x = 13,333,628,626.62
  5. Step 5: Solve for x
    x = 13,333,628,626.62/108,521.80
  6. Step 6: Final answer
    x = 122,865.90

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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.