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Finding the Fourth Proportional to 486.90, 672.19 and 330.37

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Solution

The fourth proportional to 486.90, 672.19 and 330.37 is: 456.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.90 : 672.19 = 330.37 : x
  2. Step 2: Convert to fraction form
    486.90/672.19 = 330.37/x
  3. Step 3: Cross multiply
    486.90x = 672.19 × 330.37
  4. Step 4: Simplify right side
    486.90x = 222,068.90
  5. Step 5: Solve for x
    x = 222,068.90/486.90
  6. Step 6: Final answer
    x = 456.09

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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.