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Finding the Fourth Proportional to 1,198.80, 1,654.24 and 674.80

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Solution

The fourth proportional to 1,198.80, 1,654.24 and 674.80 is: 931.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,198.80 : 1,654.24 = 674.80 : x
  2. Step 2: Convert to fraction form
    1,198.80/1,654.24 = 674.80/x
  3. Step 3: Cross multiply
    1,198.80x = 1,654.24 × 674.80
  4. Step 4: Simplify right side
    1,198.80x = 1,116,281.15
  5. Step 5: Solve for x
    x = 1,116,281.15/1,198.80
  6. Step 6: Final answer
    x = 931.17

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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.