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Finding the Fourth Proportional to 641.06, 961.60 and 256.31

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Solution

The fourth proportional to 641.06, 961.60 and 256.31 is: 384.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.06 : 961.60 = 256.31 : x
  2. Step 2: Convert to fraction form
    641.06/961.60 = 256.31/x
  3. Step 3: Cross multiply
    641.06x = 961.60 × 256.31
  4. Step 4: Simplify right side
    641.06x = 246,468.82
  5. Step 5: Solve for x
    x = 246,468.82/641.06
  6. Step 6: Final answer
    x = 384.47

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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.