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Finding the Fourth Proportional to 330.18, 455.72 and 219.66

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Solution

The fourth proportional to 330.18, 455.72 and 219.66 is: 303.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.18 : 455.72 = 219.66 : x
  2. Step 2: Convert to fraction form
    330.18/455.72 = 219.66/x
  3. Step 3: Cross multiply
    330.18x = 455.72 × 219.66
  4. Step 4: Simplify right side
    330.18x = 100,102.36
  5. Step 5: Solve for x
    x = 100,102.36/330.18
  6. Step 6: Final answer
    x = 303.18

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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.