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Finding the Fourth Proportional to 331.60, 457.48 and 257.84

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Solution

The fourth proportional to 331.60, 457.48 and 257.84 is: 355.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.60 : 457.48 = 257.84 : x
  2. Step 2: Convert to fraction form
    331.60/457.48 = 257.84/x
  3. Step 3: Cross multiply
    331.60x = 457.48 × 257.84
  4. Step 4: Simplify right side
    331.60x = 117,956.64
  5. Step 5: Solve for x
    x = 117,956.64/331.60
  6. Step 6: Final answer
    x = 355.72

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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.