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Finding the Fourth Proportional to 228.78, 315.72 and 155.22

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Solution

The fourth proportional to 228.78, 315.72 and 155.22 is: 214.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.78 : 315.72 = 155.22 : x
  2. Step 2: Convert to fraction form
    228.78/315.72 = 155.22/x
  3. Step 3: Cross multiply
    228.78x = 315.72 × 155.22
  4. Step 4: Simplify right side
    228.78x = 49,006.06
  5. Step 5: Solve for x
    x = 49,006.06/228.78
  6. Step 6: Final answer
    x = 214.21

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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.