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Finding the Fourth Proportional to 228.90, 315.09 and 199.74

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Solution

The fourth proportional to 228.90, 315.09 and 199.74 is: 274.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.90 : 315.09 = 199.74 : x
  2. Step 2: Convert to fraction form
    228.90/315.09 = 199.74/x
  3. Step 3: Cross multiply
    228.90x = 315.09 × 199.74
  4. Step 4: Simplify right side
    228.90x = 62,936.08
  5. Step 5: Solve for x
    x = 62,936.08/228.90
  6. Step 6: Final answer
    x = 274.95

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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.