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Finding the Fourth Proportional to 228.28, 315.09 and 154.68

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Solution

The fourth proportional to 228.28, 315.09 and 154.68 is: 213.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.28 : 315.09 = 154.68 : x
  2. Step 2: Convert to fraction form
    228.28/315.09 = 154.68/x
  3. Step 3: Cross multiply
    228.28x = 315.09 × 154.68
  4. Step 4: Simplify right side
    228.28x = 48,738.12
  5. Step 5: Solve for x
    x = 48,738.12/228.28
  6. Step 6: Final answer
    x = 213.50

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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.