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Finding the Fourth Proportional to 321.48, 441.72 and 307.17

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Solution

The fourth proportional to 321.48, 441.72 and 307.17 is: 422.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.48 : 441.72 = 307.17 : x
  2. Step 2: Convert to fraction form
    321.48/441.72 = 307.17/x
  3. Step 3: Cross multiply
    321.48x = 441.72 × 307.17
  4. Step 4: Simplify right side
    321.48x = 135,683.13
  5. Step 5: Solve for x
    x = 135,683.13/321.48
  6. Step 6: Final answer
    x = 422.06

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.