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Finding the Fourth Proportional to 331.79, 457.26 and 257

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Solution

The fourth proportional to 331.79, 457.26 and 257 is: 354.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.79 : 457.26 = 257 : x
  2. Step 2: Convert to fraction form
    331.79/457.26 = 257/x
  3. Step 3: Cross multiply
    331.79x = 457.26 × 257
  4. Step 4: Simplify right side
    331.79x = 117,515.82
  5. Step 5: Solve for x
    x = 117,515.82/331.79
  6. Step 6: Final answer
    x = 354.19

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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.