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Finding the Fourth Proportional to 867.18, 1,198.23 and 681.18

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Solution

The fourth proportional to 867.18, 1,198.23 and 681.18 is: 941.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.18 : 1,198.23 = 681.18 : x
  2. Step 2: Convert to fraction form
    867.18/1,198.23 = 681.18/x
  3. Step 3: Cross multiply
    867.18x = 1,198.23 × 681.18
  4. Step 4: Simplify right side
    867.18x = 816,210.31
  5. Step 5: Solve for x
    x = 816,210.31/867.18
  6. Step 6: Final answer
    x = 941.22

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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.