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Finding the Fourth Proportional to 486.82, 672.05 and 330.28

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Solution

The fourth proportional to 486.82, 672.05 and 330.28 is: 455.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.82 : 672.05 = 330.28 : x
  2. Step 2: Convert to fraction form
    486.82/672.05 = 330.28/x
  3. Step 3: Cross multiply
    486.82x = 672.05 × 330.28
  4. Step 4: Simplify right side
    486.82x = 221,963.82
  5. Step 5: Solve for x
    x = 221,963.82/486.82
  6. Step 6: Final answer
    x = 455.95

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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.