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Finding the Fourth Proportional to 81,325.54, 121,981.11 and 28,732.42

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Solution

The fourth proportional to 81,325.54, 121,981.11 and 28,732.42 is: 43,096.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,325.54 : 121,981.11 = 28,732.42 : x
  2. Step 2: Convert to fraction form
    81,325.54/121,981.11 = 28,732.42/x
  3. Step 3: Cross multiply
    81,325.54x = 121,981.11 × 28,732.42
  4. Step 4: Simplify right side
    81,325.54x = 3,504,812,484.59
  5. Step 5: Solve for x
    x = 3,504,812,484.59/81,325.54
  6. Step 6: Final answer
    x = 43,096.09

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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.