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Finding the Fourth Proportional to 869.15, 1,198.72 and 554.31

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Solution

The fourth proportional to 869.15, 1,198.72 and 554.31 is: 764.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.15 : 1,198.72 = 554.31 : x
  2. Step 2: Convert to fraction form
    869.15/1,198.72 = 554.31/x
  3. Step 3: Cross multiply
    869.15x = 1,198.72 × 554.31
  4. Step 4: Simplify right side
    869.15x = 664,460.06
  5. Step 5: Solve for x
    x = 664,460.06/869.15
  6. Step 6: Final answer
    x = 764.50

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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.