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Finding the Fourth Proportional to 866.97, 1,195.43 and 645.21

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Solution

The fourth proportional to 866.97, 1,195.43 and 645.21 is: 889.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.97 : 1,195.43 = 645.21 : x
  2. Step 2: Convert to fraction form
    866.97/1,195.43 = 645.21/x
  3. Step 3: Cross multiply
    866.97x = 1,195.43 × 645.21
  4. Step 4: Simplify right side
    866.97x = 771,300.16
  5. Step 5: Solve for x
    x = 771,300.16/866.97
  6. Step 6: Final answer
    x = 889.65

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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.