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Finding the Fourth Proportional to 850.85, 1,276.27 and 439.77

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Solution

The fourth proportional to 850.85, 1,276.27 and 439.77 is: 659.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.85 : 1,276.27 = 439.77 : x
  2. Step 2: Convert to fraction form
    850.85/1,276.27 = 439.77/x
  3. Step 3: Cross multiply
    850.85x = 1,276.27 × 439.77
  4. Step 4: Simplify right side
    850.85x = 561,265.26
  5. Step 5: Solve for x
    x = 561,265.26/850.85
  6. Step 6: Final answer
    x = 659.66

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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.