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Finding the Fourth Proportional to 256.79, 353.58 and 219.86

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Solution

The fourth proportional to 256.79, 353.58 and 219.86 is: 302.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.79 : 353.58 = 219.86 : x
  2. Step 2: Convert to fraction form
    256.79/353.58 = 219.86/x
  3. Step 3: Cross multiply
    256.79x = 353.58 × 219.86
  4. Step 4: Simplify right side
    256.79x = 77,736.33
  5. Step 5: Solve for x
    x = 77,736.33/256.79
  6. Step 6: Final answer
    x = 302.73

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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.