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Finding the Fourth Proportional to 641.17, 959.90 and 445.70

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Solution

The fourth proportional to 641.17, 959.90 and 445.70 is: 667.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.17 : 959.90 = 445.70 : x
  2. Step 2: Convert to fraction form
    641.17/959.90 = 445.70/x
  3. Step 3: Cross multiply
    641.17x = 959.90 × 445.70
  4. Step 4: Simplify right side
    641.17x = 427,830.11
  5. Step 5: Solve for x
    x = 427,830.11/641.17
  6. Step 6: Final answer
    x = 667.27

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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.