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Finding the Fourth Proportional to 643.11, 964.61 and 180.90

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Solution

The fourth proportional to 643.11, 964.61 and 180.90 is: 271.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.11 : 964.61 = 180.90 : x
  2. Step 2: Convert to fraction form
    643.11/964.61 = 180.90/x
  3. Step 3: Cross multiply
    643.11x = 964.61 × 180.90
  4. Step 4: Simplify right side
    643.11x = 174,497.72
  5. Step 5: Solve for x
    x = 174,497.72/643.11
  6. Step 6: Final answer
    x = 271.34

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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.