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Finding the Fourth Proportional to 228.26, 315.29 and 198.70

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Solution

The fourth proportional to 228.26, 315.29 and 198.70 is: 274.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.26 : 315.29 = 198.70 : x
  2. Step 2: Convert to fraction form
    228.26/315.29 = 198.70/x
  3. Step 3: Cross multiply
    228.26x = 315.29 × 198.70
  4. Step 4: Simplify right side
    228.26x = 62,648.12
  5. Step 5: Solve for x
    x = 62,648.12/228.26
  6. Step 6: Final answer
    x = 274.46

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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.