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Finding the Fourth Proportional to 850.10, 1,174.14 and 641.20

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Solution

The fourth proportional to 850.10, 1,174.14 and 641.20 is: 885.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.10 : 1,174.14 = 641.20 : x
  2. Step 2: Convert to fraction form
    850.10/1,174.14 = 641.20/x
  3. Step 3: Cross multiply
    850.10x = 1,174.14 × 641.20
  4. Step 4: Simplify right side
    850.10x = 752,858.57
  5. Step 5: Solve for x
    x = 752,858.57/850.10
  6. Step 6: Final answer
    x = 885.61

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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.