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Finding the Fourth Proportional to 321.15, 479.49 and 317.73

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Solution

The fourth proportional to 321.15, 479.49 and 317.73 is: 474.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.15 : 479.49 = 317.73 : x
  2. Step 2: Convert to fraction form
    321.15/479.49 = 317.73/x
  3. Step 3: Cross multiply
    321.15x = 479.49 × 317.73
  4. Step 4: Simplify right side
    321.15x = 152,348.36
  5. Step 5: Solve for x
    x = 152,348.36/321.15
  6. Step 6: Final answer
    x = 474.38

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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.