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Finding the Fourth Proportional to 486.94, 672.23 and 330.40

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Solution

The fourth proportional to 486.94, 672.23 and 330.40 is: 456.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.94 : 672.23 = 330.40 : x
  2. Step 2: Convert to fraction form
    486.94/672.23 = 330.40/x
  3. Step 3: Cross multiply
    486.94x = 672.23 × 330.40
  4. Step 4: Simplify right side
    486.94x = 222,104.79
  5. Step 5: Solve for x
    x = 222,104.79/486.94
  6. Step 6: Final answer
    x = 456.12

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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.