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Finding the Fourth Proportional to 379.55, 523.13 and 289.79

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Solution

The fourth proportional to 379.55, 523.13 and 289.79 is: 399.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.55 : 523.13 = 289.79 : x
  2. Step 2: Convert to fraction form
    379.55/523.13 = 289.79/x
  3. Step 3: Cross multiply
    379.55x = 523.13 × 289.79
  4. Step 4: Simplify right side
    379.55x = 151,599.88
  5. Step 5: Solve for x
    x = 151,599.88/379.55
  6. Step 6: Final answer
    x = 399.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.