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Finding the Fourth Proportional to 375.31, 518.16 and 257.48

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Solution

The fourth proportional to 375.31, 518.16 and 257.48 is: 355.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    375.31 : 518.16 = 257.48 : x
  2. Step 2: Convert to fraction form
    375.31/518.16 = 257.48/x
  3. Step 3: Cross multiply
    375.31x = 518.16 × 257.48
  4. Step 4: Simplify right side
    375.31x = 133,416.80
  5. Step 5: Solve for x
    x = 133,416.80/375.31
  6. Step 6: Final answer
    x = 355.49

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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.