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Finding the Fourth Proportional to 330.23, 455.15 and 219.51

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Solution

The fourth proportional to 330.23, 455.15 and 219.51 is: 302.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.23 : 455.15 = 219.51 : x
  2. Step 2: Convert to fraction form
    330.23/455.15 = 219.51/x
  3. Step 3: Cross multiply
    330.23x = 455.15 × 219.51
  4. Step 4: Simplify right side
    330.23x = 99,908.88
  5. Step 5: Solve for x
    x = 99,908.88/330.23
  6. Step 6: Final answer
    x = 302.55

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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.