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Finding the Fourth Proportional to 321.04, 479.06 and 318.64

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Solution

The fourth proportional to 321.04, 479.06 and 318.64 is: 475.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.04 : 479.06 = 318.64 : x
  2. Step 2: Convert to fraction form
    321.04/479.06 = 318.64/x
  3. Step 3: Cross multiply
    321.04x = 479.06 × 318.64
  4. Step 4: Simplify right side
    321.04x = 152,647.68
  5. Step 5: Solve for x
    x = 152,647.68/321.04
  6. Step 6: Final answer
    x = 475.48

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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.