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Finding the Fourth Proportional to 3,159.50, 4,739.25 and 851

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Solution

The fourth proportional to 3,159.50, 4,739.25 and 851 is: 1,276.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,159.50 : 4,739.25 = 851 : x
  2. Step 2: Convert to fraction form
    3,159.50/4,739.25 = 851/x
  3. Step 3: Cross multiply
    3,159.50x = 4,739.25 × 851
  4. Step 4: Simplify right side
    3,159.50x = 4,033,101.75
  5. Step 5: Solve for x
    x = 4,033,101.75/3,159.50
  6. Step 6: Final answer
    x = 1,276.50

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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.