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Finding the Fourth Proportional to 851.31, 1,276.97 and 636.26

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Solution

The fourth proportional to 851.31, 1,276.97 and 636.26 is: 954.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.31 : 1,276.97 = 636.26 : x
  2. Step 2: Convert to fraction form
    851.31/1,276.97 = 636.26/x
  3. Step 3: Cross multiply
    851.31x = 1,276.97 × 636.26
  4. Step 4: Simplify right side
    851.31x = 812,475.37
  5. Step 5: Solve for x
    x = 812,475.37/851.31
  6. Step 6: Final answer
    x = 954.38

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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.