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Finding the Fourth Proportional to 80,686.82, 121,046.65 and 28,100.41

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Solution

The fourth proportional to 80,686.82, 121,046.65 and 28,100.41 is: 42,156.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,686.82 : 121,046.65 = 28,100.41 : x
  2. Step 2: Convert to fraction form
    80,686.82/121,046.65 = 28,100.41/x
  3. Step 3: Cross multiply
    80,686.82x = 121,046.65 × 28,100.41
  4. Step 4: Simplify right side
    80,686.82x = 3,401,460,121.26
  5. Step 5: Solve for x
    x = 3,401,460,121.26/80,686.82
  6. Step 6: Final answer
    x = 42,156.33

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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.