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Finding the Fourth Proportional to 330.10, 455.61 and 205.81

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Solution

The fourth proportional to 330.10, 455.61 and 205.81 is: 284.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.10 : 455.61 = 205.81 : x
  2. Step 2: Convert to fraction form
    330.10/455.61 = 205.81/x
  3. Step 3: Cross multiply
    330.10x = 455.61 × 205.81
  4. Step 4: Simplify right side
    330.10x = 93,769.09
  5. Step 5: Solve for x
    x = 93,769.09/330.10
  6. Step 6: Final answer
    x = 284.06

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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.