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Finding the Fourth Proportional to 330.18, 455.40 and 205.70

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Solution

The fourth proportional to 330.18, 455.40 and 205.70 is: 283.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.18 : 455.40 = 205.70 : x
  2. Step 2: Convert to fraction form
    330.18/455.40 = 205.70/x
  3. Step 3: Cross multiply
    330.18x = 455.40 × 205.70
  4. Step 4: Simplify right side
    330.18x = 93,675.78
  5. Step 5: Solve for x
    x = 93,675.78/330.18
  6. Step 6: Final answer
    x = 283.71

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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.