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Finding the Fourth Proportional to 225.38, 310.82 and 155.45

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Solution

The fourth proportional to 225.38, 310.82 and 155.45 is: 214.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.38 : 310.82 = 155.45 : x
  2. Step 2: Convert to fraction form
    225.38/310.82 = 155.45/x
  3. Step 3: Cross multiply
    225.38x = 310.82 × 155.45
  4. Step 4: Simplify right side
    225.38x = 48,316.97
  5. Step 5: Solve for x
    x = 48,316.97/225.38
  6. Step 6: Final answer
    x = 214.38

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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.