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Finding the Fourth Proportional to 259.32, 389.01 and 76.73

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Solution

The fourth proportional to 259.32, 389.01 and 76.73 is: 115.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.32 : 389.01 = 76.73 : x
  2. Step 2: Convert to fraction form
    259.32/389.01 = 76.73/x
  3. Step 3: Cross multiply
    259.32x = 389.01 × 76.73
  4. Step 4: Simplify right side
    259.32x = 29,846.79
  5. Step 5: Solve for x
    x = 29,846.79/259.32
  6. Step 6: Final answer
    x = 115.10

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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.