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Finding the Fourth Proportional to 866.90, 1,196.86 and 535.78

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Solution

The fourth proportional to 866.90, 1,196.86 and 535.78 is: 739.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.90 : 1,196.86 = 535.78 : x
  2. Step 2: Convert to fraction form
    866.90/1,196.86 = 535.78/x
  3. Step 3: Cross multiply
    866.90x = 1,196.86 × 535.78
  4. Step 4: Simplify right side
    866.90x = 641,253.65
  5. Step 5: Solve for x
    x = 641,253.65/866.90
  6. Step 6: Final answer
    x = 739.71

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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.