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Finding the Fourth Proportional to 81,076.62, 121,082.63 and 69,102.80

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Solution

The fourth proportional to 81,076.62, 121,082.63 and 69,102.80 is: 103,200.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,076.62 : 121,082.63 = 69,102.80 : x
  2. Step 2: Convert to fraction form
    81,076.62/121,082.63 = 69,102.80/x
  3. Step 3: Cross multiply
    81,076.62x = 121,082.63 × 69,102.80
  4. Step 4: Simplify right side
    81,076.62x = 8,367,148,764.36
  5. Step 5: Solve for x
    x = 8,367,148,764.36/81,076.62
  6. Step 6: Final answer
    x = 103,200.51

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.