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Finding the Fourth Proportional to 259.41, 389.11 and 76.82

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Solution

The fourth proportional to 259.41, 389.11 and 76.82 is: 115.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.41 : 389.11 = 76.82 : x
  2. Step 2: Convert to fraction form
    259.41/389.11 = 76.82/x
  3. Step 3: Cross multiply
    259.41x = 389.11 × 76.82
  4. Step 4: Simplify right side
    259.41x = 29,890.55
  5. Step 5: Solve for x
    x = 29,890.55/259.41
  6. Step 6: Final answer
    x = 115.23

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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.