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Finding the Fourth Proportional to 256.48, 353.96 and 189.25

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Solution

The fourth proportional to 256.48, 353.96 and 189.25 is: 261.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.48 : 353.96 = 189.25 : x
  2. Step 2: Convert to fraction form
    256.48/353.96 = 189.25/x
  3. Step 3: Cross multiply
    256.48x = 353.96 × 189.25
  4. Step 4: Simplify right side
    256.48x = 66,986.93
  5. Step 5: Solve for x
    x = 66,986.93/256.48
  6. Step 6: Final answer
    x = 261.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.