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Finding the Fourth Proportional to 850.55, 1,275.89 and 439.43

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Solution

The fourth proportional to 850.55, 1,275.89 and 439.43 is: 659.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.55 : 1,275.89 = 439.43 : x
  2. Step 2: Convert to fraction form
    850.55/1,275.89 = 439.43/x
  3. Step 3: Cross multiply
    850.55x = 1,275.89 × 439.43
  4. Step 4: Simplify right side
    850.55x = 560,655.77
  5. Step 5: Solve for x
    x = 560,655.77/850.55
  6. Step 6: Final answer
    x = 659.17

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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.