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Finding the Fourth Proportional to 257.25, 385.98 and 199.59

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Solution

The fourth proportional to 257.25, 385.98 and 199.59 is: 299.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.25 : 385.98 = 199.59 : x
  2. Step 2: Convert to fraction form
    257.25/385.98 = 199.59/x
  3. Step 3: Cross multiply
    257.25x = 385.98 × 199.59
  4. Step 4: Simplify right side
    257.25x = 77,037.75
  5. Step 5: Solve for x
    x = 77,037.75/257.25
  6. Step 6: Final answer
    x = 299.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.