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Finding the Fourth Proportional to 259.42, 389.02 and 76.84

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Solution

The fourth proportional to 259.42, 389.02 and 76.84 is: 115.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.42 : 389.02 = 76.84 : x
  2. Step 2: Convert to fraction form
    259.42/389.02 = 76.84/x
  3. Step 3: Cross multiply
    259.42x = 389.02 × 76.84
  4. Step 4: Simplify right side
    259.42x = 29,892.30
  5. Step 5: Solve for x
    x = 29,892.30/259.42
  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.