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Finding the Fourth Proportional to 256.98, 355.11 and 219.63

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Solution

The fourth proportional to 256.98, 355.11 and 219.63 is: 303.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.98 : 355.11 = 219.63 : x
  2. Step 2: Convert to fraction form
    256.98/355.11 = 219.63/x
  3. Step 3: Cross multiply
    256.98x = 355.11 × 219.63
  4. Step 4: Simplify right side
    256.98x = 77,992.81
  5. Step 5: Solve for x
    x = 77,992.81/256.98
  6. Step 6: Final answer
    x = 303.50

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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.