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Finding the Fourth Proportional to 393.42, 587.40 and 331.32

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Solution

The fourth proportional to 393.42, 587.40 and 331.32 is: 494.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.42 : 587.40 = 331.32 : x
  2. Step 2: Convert to fraction form
    393.42/587.40 = 331.32/x
  3. Step 3: Cross multiply
    393.42x = 587.40 × 331.32
  4. Step 4: Simplify right side
    393.42x = 194,617.37
  5. Step 5: Solve for x
    x = 194,617.37/393.42
  6. Step 6: Final answer
    x = 494.68

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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.