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Finding the Fourth Proportional to 851.68, 1,276.08 and 768.70

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Solution

The fourth proportional to 851.68, 1,276.08 and 768.70 is: 1,151.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.68 : 1,276.08 = 768.70 : x
  2. Step 2: Convert to fraction form
    851.68/1,276.08 = 768.70/x
  3. Step 3: Cross multiply
    851.68x = 1,276.08 × 768.70
  4. Step 4: Simplify right side
    851.68x = 980,922.70
  5. Step 5: Solve for x
    x = 980,922.70/851.68
  6. Step 6: Final answer
    x = 1,151.75

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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.