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Finding the Fourth Proportional to 331.39, 457.40 and 189.64

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Solution

The fourth proportional to 331.39, 457.40 and 189.64 is: 261.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.39 : 457.40 = 189.64 : x
  2. Step 2: Convert to fraction form
    331.39/457.40 = 189.64/x
  3. Step 3: Cross multiply
    331.39x = 457.40 × 189.64
  4. Step 4: Simplify right side
    331.39x = 86,741.34
  5. Step 5: Solve for x
    x = 86,741.34/331.39
  6. Step 6: Final answer
    x = 261.75

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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.