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Finding the Fourth Proportional to 478.92, 660.55 and 321.51

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Solution

The fourth proportional to 478.92, 660.55 and 321.51 is: 443.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.92 : 660.55 = 321.51 : x
  2. Step 2: Convert to fraction form
    478.92/660.55 = 321.51/x
  3. Step 3: Cross multiply
    478.92x = 660.55 × 321.51
  4. Step 4: Simplify right side
    478.92x = 212,373.43
  5. Step 5: Solve for x
    x = 212,373.43/478.92
  6. Step 6: Final answer
    x = 443.44

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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.