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Finding the Fourth Proportional to 640.88, 961.44 and 316.08

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Solution

The fourth proportional to 640.88, 961.44 and 316.08 is: 474.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.88 : 961.44 = 316.08 : x
  2. Step 2: Convert to fraction form
    640.88/961.44 = 316.08/x
  3. Step 3: Cross multiply
    640.88x = 961.44 × 316.08
  4. Step 4: Simplify right side
    640.88x = 303,891.96
  5. Step 5: Solve for x
    x = 303,891.96/640.88
  6. Step 6: Final answer
    x = 474.18

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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.