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Finding the Fourth Proportional to 257.19, 354.69 and 198.87

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Solution

The fourth proportional to 257.19, 354.69 and 198.87 is: 274.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.19 : 354.69 = 198.87 : x
  2. Step 2: Convert to fraction form
    257.19/354.69 = 198.87/x
  3. Step 3: Cross multiply
    257.19x = 354.69 × 198.87
  4. Step 4: Simplify right side
    257.19x = 70,537.20
  5. Step 5: Solve for x
    x = 70,537.20/257.19
  6. Step 6: Final answer
    x = 274.26

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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.