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Finding the Fourth Proportional to 640.61, 960.80 and 178.30

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Solution

The fourth proportional to 640.61, 960.80 and 178.30 is: 267.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.61 : 960.80 = 178.30 : x
  2. Step 2: Convert to fraction form
    640.61/960.80 = 178.30/x
  3. Step 3: Cross multiply
    640.61x = 960.80 × 178.30
  4. Step 4: Simplify right side
    640.61x = 171,310.95
  5. Step 5: Solve for x
    x = 171,310.95/640.61
  6. Step 6: Final answer
    x = 267.42

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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.