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Finding the Fourth Proportional to 478.60, 660.92 and 321.36

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Solution

The fourth proportional to 478.60, 660.92 and 321.36 is: 443.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.60 : 660.92 = 321.36 : x
  2. Step 2: Convert to fraction form
    478.60/660.92 = 321.36/x
  3. Step 3: Cross multiply
    478.60x = 660.92 × 321.36
  4. Step 4: Simplify right side
    478.60x = 212,393.25
  5. Step 5: Solve for x
    x = 212,393.25/478.60
  6. Step 6: Final answer
    x = 443.78

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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.