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Finding the Fourth Proportional to 321.51, 479.17 and 318.83

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Solution

The fourth proportional to 321.51, 479.17 and 318.83 is: 475.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.51 : 479.17 = 318.83 : x
  2. Step 2: Convert to fraction form
    321.51/479.17 = 318.83/x
  3. Step 3: Cross multiply
    321.51x = 479.17 × 318.83
  4. Step 4: Simplify right side
    321.51x = 152,773.57
  5. Step 5: Solve for x
    x = 152,773.57/321.51
  6. Step 6: Final answer
    x = 475.18

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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.