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Finding the Fourth Proportional to 81,379.64, 121,732.44 and 76,403

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Solution

The fourth proportional to 81,379.64, 121,732.44 and 76,403 is: 114,288.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,379.64 : 121,732.44 = 76,403 : x
  2. Step 2: Convert to fraction form
    81,379.64/121,732.44 = 76,403/x
  3. Step 3: Cross multiply
    81,379.64x = 121,732.44 × 76,403
  4. Step 4: Simplify right side
    81,379.64x = 9,300,723,613.32
  5. Step 5: Solve for x
    x = 9,300,723,613.32/81,379.64
  6. Step 6: Final answer
    x = 114,288.09

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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.