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Finding the Fourth Proportional to 256.52, 353.52 and 219.20

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Solution

The fourth proportional to 256.52, 353.52 and 219.20 is: 302.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.52 : 353.52 = 219.20 : x
  2. Step 2: Convert to fraction form
    256.52/353.52 = 219.20/x
  3. Step 3: Cross multiply
    256.52x = 353.52 × 219.20
  4. Step 4: Simplify right side
    256.52x = 77,491.58
  5. Step 5: Solve for x
    x = 77,491.58/256.52
  6. Step 6: Final answer
    x = 302.09

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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.