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Finding the Fourth Proportional to 871.74, 1,201.86 and 635.72

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Solution

The fourth proportional to 871.74, 1,201.86 and 635.72 is: 876.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.74 : 1,201.86 = 635.72 : x
  2. Step 2: Convert to fraction form
    871.74/1,201.86 = 635.72/x
  3. Step 3: Cross multiply
    871.74x = 1,201.86 × 635.72
  4. Step 4: Simplify right side
    871.74x = 764,040.43
  5. Step 5: Solve for x
    x = 764,040.43/871.74
  6. Step 6: Final answer
    x = 876.45

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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.