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Finding the Fourth Proportional to 439.89, 659.94 and 256.96

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Solution

The fourth proportional to 439.89, 659.94 and 256.96 is: 385.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.89 : 659.94 = 256.96 : x
  2. Step 2: Convert to fraction form
    439.89/659.94 = 256.96/x
  3. Step 3: Cross multiply
    439.89x = 659.94 × 256.96
  4. Step 4: Simplify right side
    439.89x = 169,578.18
  5. Step 5: Solve for x
    x = 169,578.18/439.89
  6. Step 6: Final answer
    x = 385.50

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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.