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Finding the Fourth Proportional to 330.17, 455.68 and 274.81

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Solution

The fourth proportional to 330.17, 455.68 and 274.81 is: 379.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.17 : 455.68 = 274.81 : x
  2. Step 2: Convert to fraction form
    330.17/455.68 = 274.81/x
  3. Step 3: Cross multiply
    330.17x = 455.68 × 274.81
  4. Step 4: Simplify right side
    330.17x = 125,224.05
  5. Step 5: Solve for x
    x = 125,224.05/330.17
  6. Step 6: Final answer
    x = 379.28

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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.