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Finding the Fourth Proportional to 439.01, 659.22 and 285.31

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Solution

The fourth proportional to 439.01, 659.22 and 285.31 is: 428.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.01 : 659.22 = 285.31 : x
  2. Step 2: Convert to fraction form
    439.01/659.22 = 285.31/x
  3. Step 3: Cross multiply
    439.01x = 659.22 × 285.31
  4. Step 4: Simplify right side
    439.01x = 188,082.06
  5. Step 5: Solve for x
    x = 188,082.06/439.01
  6. Step 6: Final answer
    x = 428.42

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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.