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Finding the Fourth Proportional to 321.08, 479.49 and 317.66

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Solution

The fourth proportional to 321.08, 479.49 and 317.66 is: 474.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.08 : 479.49 = 317.66 : x
  2. Step 2: Convert to fraction form
    321.08/479.49 = 317.66/x
  3. Step 3: Cross multiply
    321.08x = 479.49 × 317.66
  4. Step 4: Simplify right side
    321.08x = 152,312.40
  5. Step 5: Solve for x
    x = 152,312.40/321.08
  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.