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Finding the Fourth Proportional to 228.19, 315.17 and 154.38

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Solution

The fourth proportional to 228.19, 315.17 and 154.38 is: 213.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.19 : 315.17 = 154.38 : x
  2. Step 2: Convert to fraction form
    228.19/315.17 = 154.38/x
  3. Step 3: Cross multiply
    228.19x = 315.17 × 154.38
  4. Step 4: Simplify right side
    228.19x = 48,654.57
  5. Step 5: Solve for x
    x = 48,654.57/228.19
  6. Step 6: Final answer
    x = 213.22

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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.