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Finding the Fourth Proportional to 871.96, 1,299.08 and 834.70

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Solution

The fourth proportional to 871.96, 1,299.08 and 834.70 is: 1,243.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.96 : 1,299.08 = 834.70 : x
  2. Step 2: Convert to fraction form
    871.96/1,299.08 = 834.70/x
  3. Step 3: Cross multiply
    871.96x = 1,299.08 × 834.70
  4. Step 4: Simplify right side
    871.96x = 1,084,342.08
  5. Step 5: Solve for x
    x = 1,084,342.08/871.96
  6. Step 6: Final answer
    x = 1,243.57

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.