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Finding the Fourth Proportional to 361, 498.18 and 257.68

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Solution

The fourth proportional to 361, 498.18 and 257.68 is: 355.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    361 : 498.18 = 257.68 : x
  2. Step 2: Convert to fraction form
    361/498.18 = 257.68/x
  3. Step 3: Cross multiply
    361x = 498.18 × 257.68
  4. Step 4: Simplify right side
    361x = 128,371.02
  5. Step 5: Solve for x
    x = 128,371.02/361
  6. Step 6: Final answer
    x = 355.60

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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.