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Finding the Fourth Proportional to 478.99, 660.99 and 321.94

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Solution

The fourth proportional to 478.99, 660.99 and 321.94 is: 444.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.99 : 660.99 = 321.94 : x
  2. Step 2: Convert to fraction form
    478.99/660.99 = 321.94/x
  3. Step 3: Cross multiply
    478.99x = 660.99 × 321.94
  4. Step 4: Simplify right side
    478.99x = 212,799.12
  5. Step 5: Solve for x
    x = 212,799.12/478.99
  6. Step 6: Final answer
    x = 444.27

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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.