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Finding the Fourth Proportional to 394.49, 542.66 and 320.64

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Solution

The fourth proportional to 394.49, 542.66 and 320.64 is: 441.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.49 : 542.66 = 320.64 : x
  2. Step 2: Convert to fraction form
    394.49/542.66 = 320.64/x
  3. Step 3: Cross multiply
    394.49x = 542.66 × 320.64
  4. Step 4: Simplify right side
    394.49x = 173,996.90
  5. Step 5: Solve for x
    x = 173,996.90/394.49
  6. Step 6: Final answer
    x = 441.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.