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Finding the Fourth Proportional to 641.88, 963 and 317.61

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Solution

The fourth proportional to 641.88, 963 and 317.61 is: 476.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.88 : 963 = 317.61 : x
  2. Step 2: Convert to fraction form
    641.88/963 = 317.61/x
  3. Step 3: Cross multiply
    641.88x = 963 × 317.61
  4. Step 4: Simplify right side
    641.88x = 305,858.43
  5. Step 5: Solve for x
    x = 305,858.43/641.88
  6. Step 6: Final answer
    x = 476.50

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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.