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Finding the Fourth Proportional to 641.16, 961.76 and 256.68

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Solution

The fourth proportional to 641.16, 961.76 and 256.68 is: 385.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.16 : 961.76 = 256.68 : x
  2. Step 2: Convert to fraction form
    641.16/961.76 = 256.68/x
  3. Step 3: Cross multiply
    641.16x = 961.76 × 256.68
  4. Step 4: Simplify right side
    641.16x = 246,864.56
  5. Step 5: Solve for x
    x = 246,864.56/641.16
  6. Step 6: Final answer
    x = 385.03

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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.