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Finding the Fourth Proportional to 251.13, 378.81 and 236.15

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Solution

The fourth proportional to 251.13, 378.81 and 236.15 is: 356.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.13 : 378.81 = 236.15 : x
  2. Step 2: Convert to fraction form
    251.13/378.81 = 236.15/x
  3. Step 3: Cross multiply
    251.13x = 378.81 × 236.15
  4. Step 4: Simplify right side
    251.13x = 89,454.09
  5. Step 5: Solve for x
    x = 89,454.09/251.13
  6. Step 6: Final answer
    x = 356.21

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.