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Finding the Fourth Proportional to 851.17, 1,175.31 and 684.85

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Solution

The fourth proportional to 851.17, 1,175.31 and 684.85 is: 945.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.17 : 1,175.31 = 684.85 : x
  2. Step 2: Convert to fraction form
    851.17/1,175.31 = 684.85/x
  3. Step 3: Cross multiply
    851.17x = 1,175.31 × 684.85
  4. Step 4: Simplify right side
    851.17x = 804,911.05
  5. Step 5: Solve for x
    x = 804,911.05/851.17
  6. Step 6: Final answer
    x = 945.65

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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.