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Finding the Fourth Proportional to 393.72, 542.64 and 320.22

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Solution

The fourth proportional to 393.72, 542.64 and 320.22 is: 441.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.72 : 542.64 = 320.22 : x
  2. Step 2: Convert to fraction form
    393.72/542.64 = 320.22/x
  3. Step 3: Cross multiply
    393.72x = 542.64 × 320.22
  4. Step 4: Simplify right side
    393.72x = 173,764.18
  5. Step 5: Solve for x
    x = 173,764.18/393.72
  6. Step 6: Final answer
    x = 441.34

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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.