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Finding the Fourth Proportional to 259.42, 389.19 and 76.83

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Solution

The fourth proportional to 259.42, 389.19 and 76.83 is: 115.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.42 : 389.19 = 76.83 : x
  2. Step 2: Convert to fraction form
    259.42/389.19 = 76.83/x
  3. Step 3: Cross multiply
    259.42x = 389.19 × 76.83
  4. Step 4: Simplify right side
    259.42x = 29,901.28
  5. Step 5: Solve for x
    x = 29,901.28/259.42
  6. Step 6: Final answer
    x = 115.26

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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.