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Finding the Fourth Proportional to 871.67, 1,200.75 and 674.84

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Solution

The fourth proportional to 871.67, 1,200.75 and 674.84 is: 929.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.67 : 1,200.75 = 674.84 : x
  2. Step 2: Convert to fraction form
    871.67/1,200.75 = 674.84/x
  3. Step 3: Cross multiply
    871.67x = 1,200.75 × 674.84
  4. Step 4: Simplify right side
    871.67x = 810,314.13
  5. Step 5: Solve for x
    x = 810,314.13/871.67
  6. Step 6: Final answer
    x = 929.61

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Double scale
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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.