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Finding the Fourth Proportional to 439.20, 659.13 and 274.91

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Solution

The fourth proportional to 439.20, 659.13 and 274.91 is: 412.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.20 : 659.13 = 274.91 : x
  2. Step 2: Convert to fraction form
    439.20/659.13 = 274.91/x
  3. Step 3: Cross multiply
    439.20x = 659.13 × 274.91
  4. Step 4: Simplify right side
    439.20x = 181,197.10
  5. Step 5: Solve for x
    x = 181,197.10/439.20
  6. Step 6: Final answer
    x = 412.56

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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.