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Finding the Fourth Proportional to 335.72, 500.20 and 321.74

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Solution

The fourth proportional to 335.72, 500.20 and 321.74 is: 479.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    335.72 : 500.20 = 321.74 : x
  2. Step 2: Convert to fraction form
    335.72/500.20 = 321.74/x
  3. Step 3: Cross multiply
    335.72x = 500.20 × 321.74
  4. Step 4: Simplify right side
    335.72x = 160,934.35
  5. Step 5: Solve for x
    x = 160,934.35/335.72
  6. Step 6: Final answer
    x = 479.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.