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Finding the Fourth Proportional to 850.50, 1,275.08 and 439.70

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Solution

The fourth proportional to 850.50, 1,275.08 and 439.70 is: 659.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.50 : 1,275.08 = 439.70 : x
  2. Step 2: Convert to fraction form
    850.50/1,275.08 = 439.70/x
  3. Step 3: Cross multiply
    850.50x = 1,275.08 × 439.70
  4. Step 4: Simplify right side
    850.50x = 560,644.10
  5. Step 5: Solve for x
    x = 560,644.10/850.50
  6. Step 6: Final answer
    x = 659.19

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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.