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Finding the Fourth Proportional to 640.95, 961.36 and 178.73

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Solution

The fourth proportional to 640.95, 961.36 and 178.73 is: 268.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.95 : 961.36 = 178.73 : x
  2. Step 2: Convert to fraction form
    640.95/961.36 = 178.73/x
  3. Step 3: Cross multiply
    640.95x = 961.36 × 178.73
  4. Step 4: Simplify right side
    640.95x = 171,828.64
  5. Step 5: Solve for x
    x = 171,828.64/640.95
  6. Step 6: Final answer
    x = 268.09

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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.