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Finding the Fourth Proportional to 256.98, 354.38 and 219.36

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Solution

The fourth proportional to 256.98, 354.38 and 219.36 is: 302.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.98 : 354.38 = 219.36 : x
  2. Step 2: Convert to fraction form
    256.98/354.38 = 219.36/x
  3. Step 3: Cross multiply
    256.98x = 354.38 × 219.36
  4. Step 4: Simplify right side
    256.98x = 77,735.70
  5. Step 5: Solve for x
    x = 77,735.70/256.98
  6. Step 6: Final answer
    x = 302.50

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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.