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Finding the Fourth Proportional to 866.98, 1,196.51 and 680.81

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Solution

The fourth proportional to 866.98, 1,196.51 and 680.81 is: 939.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.98 : 1,196.51 = 680.81 : x
  2. Step 2: Convert to fraction form
    866.98/1,196.51 = 680.81/x
  3. Step 3: Cross multiply
    866.98x = 1,196.51 × 680.81
  4. Step 4: Simplify right side
    866.98x = 814,592.57
  5. Step 5: Solve for x
    x = 814,592.57/866.98
  6. Step 6: Final answer
    x = 939.58

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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.