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Finding the Fourth Proportional to 850.05, 1,274.26 and 641.49

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Solution

The fourth proportional to 850.05, 1,274.26 and 641.49 is: 961.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.05 : 1,274.26 = 641.49 : x
  2. Step 2: Convert to fraction form
    850.05/1,274.26 = 641.49/x
  3. Step 3: Cross multiply
    850.05x = 1,274.26 × 641.49
  4. Step 4: Simplify right side
    850.05x = 817,425.05
  5. Step 5: Solve for x
    x = 817,425.05/850.05
  6. Step 6: Final answer
    x = 961.62

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1.5x scale

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.