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Finding the Fourth Proportional to 640.81, 961.10 and 178.46

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Solution

The fourth proportional to 640.81, 961.10 and 178.46 is: 267.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.81 : 961.10 = 178.46 : x
  2. Step 2: Convert to fraction form
    640.81/961.10 = 178.46/x
  3. Step 3: Cross multiply
    640.81x = 961.10 × 178.46
  4. Step 4: Simplify right side
    640.81x = 171,517.91
  5. Step 5: Solve for x
    x = 171,517.91/640.81
  6. Step 6: Final answer
    x = 267.66

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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.