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Finding the Fourth Proportional to 850.10, 1,172.85 and 539.78

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Solution

The fourth proportional to 850.10, 1,172.85 and 539.78 is: 744.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.10 : 1,172.85 = 539.78 : x
  2. Step 2: Convert to fraction form
    850.10/1,172.85 = 539.78/x
  3. Step 3: Cross multiply
    850.10x = 1,172.85 × 539.78
  4. Step 4: Simplify right side
    850.10x = 633,080.97
  5. Step 5: Solve for x
    x = 633,080.97/850.10
  6. Step 6: Final answer
    x = 744.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.