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Finding the Fourth Proportional to 850.74, 1,276.31 and 439.84

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Solution

The fourth proportional to 850.74, 1,276.31 and 439.84 is: 659.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.74 : 1,276.31 = 439.84 : x
  2. Step 2: Convert to fraction form
    850.74/1,276.31 = 439.84/x
  3. Step 3: Cross multiply
    850.74x = 1,276.31 × 439.84
  4. Step 4: Simplify right side
    850.74x = 561,372.19
  5. Step 5: Solve for x
    x = 561,372.19/850.74
  6. Step 6: Final answer
    x = 659.86

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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.