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Finding the Fourth Proportional to 138,651.28, 191,455.41 and 87,753.81

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Solution

The fourth proportional to 138,651.28, 191,455.41 and 87,753.81 is: 121,174.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,651.28 : 191,455.41 = 87,753.81 : x
  2. Step 2: Convert to fraction form
    138,651.28/191,455.41 = 87,753.81/x
  3. Step 3: Cross multiply
    138,651.28x = 191,455.41 × 87,753.81
  4. Step 4: Simplify right side
    138,651.28x = 16,800,942,719.65
  5. Step 5: Solve for x
    x = 16,800,942,719.65/138,651.28
  6. Step 6: Final answer
    x = 121,174.09

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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.