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Finding the Fourth Proportional to 478.88, 660.84 and 321.32

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Solution

The fourth proportional to 478.88, 660.84 and 321.32 is: 443.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.88 : 660.84 = 321.32 : x
  2. Step 2: Convert to fraction form
    478.88/660.84 = 321.32/x
  3. Step 3: Cross multiply
    478.88x = 660.84 × 321.32
  4. Step 4: Simplify right side
    478.88x = 212,341.11
  5. Step 5: Solve for x
    x = 212,341.11/478.88
  6. Step 6: Final answer
    x = 443.41

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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.