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Finding the Fourth Proportional to 479.18, 660.89 and 321.76

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Solution

The fourth proportional to 479.18, 660.89 and 321.76 is: 443.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.18 : 660.89 = 321.76 : x
  2. Step 2: Convert to fraction form
    479.18/660.89 = 321.76/x
  3. Step 3: Cross multiply
    479.18x = 660.89 × 321.76
  4. Step 4: Simplify right side
    479.18x = 212,647.97
  5. Step 5: Solve for x
    x = 212,647.97/479.18
  6. Step 6: Final answer
    x = 443.77

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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.