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Finding the Fourth Proportional to 642.20, 963.27 and 180

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Solution

The fourth proportional to 642.20, 963.27 and 180 is: 269.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.20 : 963.27 = 180 : x
  2. Step 2: Convert to fraction form
    642.20/963.27 = 180/x
  3. Step 3: Cross multiply
    642.20x = 963.27 × 180
  4. Step 4: Simplify right side
    642.20x = 173,388.60
  5. Step 5: Solve for x
    x = 173,388.60/642.20
  6. Step 6: Final answer
    x = 269.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.