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Finding the Fourth Proportional to 393.60, 542.94 and 331.72

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Solution

The fourth proportional to 393.60, 542.94 and 331.72 is: 457.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.60 : 542.94 = 331.72 : x
  2. Step 2: Convert to fraction form
    393.60/542.94 = 331.72/x
  3. Step 3: Cross multiply
    393.60x = 542.94 × 331.72
  4. Step 4: Simplify right side
    393.60x = 180,104.06
  5. Step 5: Solve for x
    x = 180,104.06/393.60
  6. Step 6: Final answer
    x = 457.58

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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.