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Finding the Fourth Proportional to 855.28, 1,180.74 and 658.36

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Solution

The fourth proportional to 855.28, 1,180.74 and 658.36 is: 908.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.28 : 1,180.74 = 658.36 : x
  2. Step 2: Convert to fraction form
    855.28/1,180.74 = 658.36/x
  3. Step 3: Cross multiply
    855.28x = 1,180.74 × 658.36
  4. Step 4: Simplify right side
    855.28x = 777,351.99
  5. Step 5: Solve for x
    x = 777,351.99/855.28
  6. Step 6: Final answer
    x = 908.89

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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.