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Finding the Fourth Proportional to 641.10, 961.62 and 178.86

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Solution

The fourth proportional to 641.10, 961.62 and 178.86 is: 268.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.10 : 961.62 = 178.86 : x
  2. Step 2: Convert to fraction form
    641.10/961.62 = 178.86/x
  3. Step 3: Cross multiply
    641.10x = 961.62 × 178.86
  4. Step 4: Simplify right side
    641.10x = 171,995.35
  5. Step 5: Solve for x
    x = 171,995.35/641.10
  6. Step 6: Final answer
    x = 268.28

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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.