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Finding the Fourth Proportional to 439.93, 659.28 and 426.79

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Solution

The fourth proportional to 439.93, 659.28 and 426.79 is: 639.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.93 : 659.28 = 426.79 : x
  2. Step 2: Convert to fraction form
    439.93/659.28 = 426.79/x
  3. Step 3: Cross multiply
    439.93x = 659.28 × 426.79
  4. Step 4: Simplify right side
    439.93x = 281,370.81
  5. Step 5: Solve for x
    x = 281,370.81/439.93
  6. Step 6: Final answer
    x = 639.59

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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.