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Finding the Fourth Proportional to 486.80, 672.06 and 320.95

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Solution

The fourth proportional to 486.80, 672.06 and 320.95 is: 443.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.80 : 672.06 = 320.95 : x
  2. Step 2: Convert to fraction form
    486.80/672.06 = 320.95/x
  3. Step 3: Cross multiply
    486.80x = 672.06 × 320.95
  4. Step 4: Simplify right side
    486.80x = 215,697.66
  5. Step 5: Solve for x
    x = 215,697.66/486.80
  6. Step 6: Final answer
    x = 443.09

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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.