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Finding the Fourth Proportional to 329.71, 455.15 and 198.69

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Solution

The fourth proportional to 329.71, 455.15 and 198.69 is: 274.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.71 : 455.15 = 198.69 : x
  2. Step 2: Convert to fraction form
    329.71/455.15 = 198.69/x
  3. Step 3: Cross multiply
    329.71x = 455.15 × 198.69
  4. Step 4: Simplify right side
    329.71x = 90,432.76
  5. Step 5: Solve for x
    x = 90,432.76/329.71
  6. Step 6: Final answer
    x = 274.28

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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.